Hoshizaki HH1-SSB-HS Hot Holding Cabinet, Single Section User Manual

Hoshizaki

“A Superior Degree

of Reliability”

www.hoshizaki.com

Models

SSB

Professional and TempGuard Series

Refrigerated Kitchen Equipment

Hoshizaki America, Inc.

Number: 73077

Issued: 3-8-1999

Revised: 5-22-2012

SERVICE MANUAL

WARNING

Only qualied service technicians should install and service the appliance. To

obtain the name and phone number of your local Hoshizaki Certied Service

Representative, visit www.hoshizaki.com. No service should be undertaken until

the technician has thoroughly read this Service Manual. Failure to service and

maintain the appliance in accordance with this manual will adversely affect safety,

performance, component life, and warranty coverage. Proper installation is the

responsibility of the installer. Product failure or property damage due to improper

installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the

service and maintenance of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily

addressed, please call, send an e-mail message, or write to the Hoshizaki Technical

Support Department for assistance.

Phone: 1-800-233-1940; (770) 487-2331

Fax: 1-800-843-1056; (770) 487-3360

E-mail: techsuppor[email protected]

HOSHIZAKI AMERICA, INC.

618 Highway 74 South

Peachtree City, GA 30269

Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

•ModelNumber________________________

•SerialNumber________________________

•Completeanddetailedexplanationoftheproblem.

CONTENTS

Important Safety Information ................................................................................................. 6

I. Specications ...................................................................................................................... 9

A. Electrical and Refrigerant Data ..................................................................................... 9

II. General Information ......................................................................................................... 10

A. Construction ................................................................................................................ 10

1. One Section ........................................................................................................... 10

2. Two Section ............................................................................................................11

3. Three Section ........................................................................................................ 12

4. Pass Thru .............................................................................................................. 13

5. Roll-In .................................................................................................................... 14

6. Roll Thru ................................................................................................................ 15

B. Sequence of Operation ............................................................................................... 16

1. Sequence Cycles and Shutdown ........................................................................... 16

a) Refrigerator and RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator ............................ 16

b) Freezer and RFH1-SSB(-HD)(-HS)(-HSE) Freezer .......................................... 18

2. Sequence Flow Chart ............................................................................................ 23

a) Refrigerator ...................................................................................................... 23

b) Freezer ............................................................................................................. 24

C. Display Board .............................................................................................................. 25

1. Location ................................................................................................................. 25

2. Display Board Layout ............................................................................................. 25

D. Control Board .............................................................................................................. 26

1. Location ................................................................................................................. 26

2. Control Board Layout ............................................................................................. 27

E. Controls and Adjustments ........................................................................................... 28

1. Guarded Access Menu ........................................................................................... 28

a) Temperature Setpoint ....................................................................................... 28

b) Defrost Frequency ............................................................................................ 28

c) Temperature Display Scale (°F or °C) .............................................................. 29

2. Service Menu ........................................................................................................ 30

3. LED Lights and Alarm Safeties Chart .................................................................... 31

4. Default Dip Switch Settings.................................................................................... 33

a) Appliance Operation (Freezer/Refrigerator) (S3 dip switch 1) .......................... 34

b) Cabinet Light/Heated Glass Door (S3 dip switch 2) ......................................... 34

c) Door Switch Type (S3 dip switch 3) .................................................................. 34

d) Refrigerator Defrost Initiation Temperature (S3 dip switch 4) ........................... 34

e) Display Board Operation (S3 dip switch 5) ...................................................... 35

f) Dual Temp Models (S3 dip switch 6) ................................................................. 35

g) Freezer Evaporator Fan Operation (except RFH1) (S3 dip switch 7) ............... 35

h) Dual Temp Freezer Component Control (S3 dip switch 8) ............................... 36

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read

the warnings and guidelines contained in this booklet carefully as they provide

essential information for the continued safe use, service, and maintenance of the

appliance. Retain this booklet for any further reference that may be necessary.

F. Compressor Protector, Short Cycle Protection, and High-Pressure Switch ......................... 37

G. Perimeter Frame Heater ............................................................................................. 37

H. Thermistors ................................................................................................................. 37

I. Glass Door Heater ........................................................................................................ 37

III. Service Diagnosis ........................................................................................................... 38

A. Diagnostic Procedure .................................................................................................. 38

1. Refrigerator and RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator ................................... 39

2a. Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)(-HSE) Freezer ... 43

2b. Freezer (auxiliary code P-6 and later) and RFH1-SSB-HD Freezer ..................... 47

B. Control Board Check ................................................................................................... 52

C. Thermistor Check ........................................................................................................ 53

D. Clogged Filter Thermostat and High-Pressure Switch ................................................. 54

E. Diagnostic Chart ......................................................................................................... 55

IV. Replacement of Components ......................................................................................... 57

A. Service for Refrigerant Lines ....................................................................................... 57

1. Refrigerant Recovery ............................................................................................. 57

2. Brazing .................................................................................................................. 58

3. Evacuation and Recharge (R-404A) ...................................................................... 58

B. Important Notes for Component Replacement ............................................................ 59

C. Removal and Replacement of Evaporator Fan Shroud Assembly ............................... 60

D. Removal and Replacement of Heat Shield on FH2-SSB(-HD) ................................... 61

E. Removal and Replacement of Door Closure Spring ................................................... 62

F. Door Re-Hinging (except glass doors) ......................................................................... 63

V. Maintenance .................................................................................................................... 64

A. Cleaning Instructions .................................................................................................. 64

1. Exterior ................................................................................................................... 64

2. Cabinet Interior ...................................................................................................... 64

3. Door Gaskets ......................................................................................................... 64

4. Shelves .................................................................................................................. 64

5. Glass Door ............................................................................................................. 64

B. Maintenance ................................................................................................................ 65

1. Condenser .............................................................................................................. 65

2. Power Supply Connection ...................................................................................... 65

C. Preparing the Appliance for Periods of Non-Use ......................................................... 65

VI. Disposal .......................................................................................................................... 66

VII. Wiring Diagrams ............................................................................................................ 67

A1. RH1-SSB(-HD) (auxiliary code L-5 and earlier) ......................................................... 67

A2. RH1-SSB(-HD)(-CF) (auxiliary code M-5 and later) .................................................. 68

B1. RH2-SSB(-HD) (auxiliary code L-5 and earlier) ......................................................... 69

B2. RH2-SSB(-HD) (auxiliary code M-5 and later) .......................................................... 70

C1. RH3-SSB(-HD) (auxiliary code L-5 and earlier) ......................................................... 71

C2. RH3-SSB(-HD) (auxiliary code M-5 and later) .......................................................... 72

D1. RH1-SSB-GD (auxiliary code N-6 and earlier) .......................................................... 73

D2. RH1-SSB-GD (auxiliary code P-5 and later) ..............................................................74

E1. RH2-SSB-GD (auxiliary code N-6 and earlier) .......................................................... 75

E2. RH2-SSB-GD (auxiliary code P-5 and later) ............................................................. 76

F1. RH3-SSB-GD (auxiliary code S-5 and earlier)........................................................... 77

F2. RH3-SSB-FG(-HG) (auxiliary code T-5 to V-5) .......................................................... 78

F3. RH3-SSB-FG(-HG) (auxiliary code A-5 and later) ..................................................... 79

G1. FH1-SSB(-HD) (auxiliary code P-5 and earlier) ......................................................... 80

G2. FH1-SSB(-HD) (auxiliary code P-6 to S-5) ................................................................ 81

G3. FH1-SSB(-HD) (auxiliary code S-6 and later) ........................................................... 82

H1. FH2-SSB(-HD) (auxiliary code P-5 and earlier)......................................................... 83

H2. FH2-SSB(-HD)(-HDCU) (auxiliary code P-6 and later) ............................................. 84

I. RFH1-SSB-HD .............................................................................................................. 85

1. Refrigerator ............................................................................................................ 85

2a. Freezer (auxiliary code P-5 and earlier) .............................................................. 86

2b. Freezer (auxiliary code Q-5 and later) ................................................................. 87

J. RFH1-SSB(-HS)(-HSE) ................................................................................................ 88

1. Refrigerator ............................................................................................................ 88

2. Freezer .................................................................................................................. 89

K. RFH2-SSB(-HD).......................................................................................................... 90

L. RFH3-SSB(-HD) .......................................................................................................... 90

M. PTR1SSB01-10 ........................................................................................................... 91

N. PTR1SSB(-FSFS)(-HSHS) ......................................................................................... 92

O. PTR1SSB(-FGFG)(HGHS)(-HGHG) (Auxiliary Code T-5 and Earlier) ........................ 93

P. PTR1SSB(-FGFG)(-HGHS)(-HGHG) (Auxiliary Code T-6 and Later) .......................... 94

Q. PTR2SSB(-FSFS)(-HSHS) ......................................................................................... 95

R. PTR2SSB(-FGFG)(-HGHG)........................................................................................ 96

S. RIR1-SSB .................................................................................................................... 97

T. RIR2-SSB .................................................................................................................... 98

U. RIR2-SSB51-02 ........................................................................................................... 99

V. RTR1-SSB ................................................................................................................. 100

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could

result in death, serious injury, or damage to the appliance or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

This appliance should be destined only to the use for which it has been expressly

conceived. Any other use should be considered improper and therefore dangerous.

The manufacturer cannot be held responsible for injury or damage resulting from

improper, incorrect, and unreasonable use. Failure to service and maintain the

appliance in accordance with this manual will adversely affect safety, performance,

component life, and warranty coverage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic

precautions including the following:

•Onlyqualiedservicetechniciansshouldinstallandservicethisappliance.

•Thisappliancemustbeinstalledinaccordancewithapplicablenational,state,and

local codes and regulations.

For Power Cord Models

•Thisappliancerequiresanindependentpowersupplyofpropercapacity.See

the nameplate for electrical specications. Failure to use an independent power

supply of proper capacity can result in a tripped breaker, blown fuse, or damage

to existing wiring. This could lead to heat generation or re.

•Toreducetheriskofelectricshock,donottouchtheplugorpowerswitchwith

damp hands.

•Makesurethepowerswitchisinthe"OFF"positionbeforeplugginginor

unplugging the appliance to reduce the risk of electric shock.

•Beforeservicing,movethepowerswitchtothe"OFF"position.Unplugthe

appliance from the electrical outlet.

•Donotuseanextensioncord.

•Donotuseanappliancewithadamagedpowercord.Thepowercordshouldnot

be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions

could result in electric shock or re. To unplug the appliance, be sure to pull the

plug, not the cord, and do not jerk the cord.

WARNING, continued

•THIS APPLIANCE MUST BE GROUNDED. This appliance is equipped with a

NEMA5-15 three-prong grounding plug

to reduce the risk of potential shock

hazards. It must be plugged into a properly grounded, independent 3-prong wall

outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a

qualied electrician replace it with a properly grounded, independent 3-prong wall

outlet. Do not remove the ground prong from the plug and do not use an adapter

plug. Failure to follow these instructions could result in death, serious injury, re,

or damage to the appliance.

•TheGREENgroundwireinthefactory-installedpowercordisconnectedtothe

appliance. If it becomes necessary to remove or replace the power cord, be sure

to connect the power cord's ground wire.

For Hard-Wired Models

•Electricalconnectionmustbehard-wiredandmustmeetnational,state,andlocal

electrical code requirements. Failure to meet these code requirements could

result in death, electric shock, serious injury, re, or severe damage to equipment.

•Thisappliancerequiresanindependentpowersupplyofpropercapacity.See

the nameplate for electrical specications. Failure to use an independent power

supply of proper capacity can result in a tripped breaker, blown fuse, or damage

to existing wiring. This could lead to heat generation or re.

•Toreducetheriskofelectricshock,donottouchthepowerswitchwithdamp

hands.

•Beforeservicing,movethepowerswitchtothe"OFF"positionandturnoffthe

power supply. Lockout/Tagout to prevent the power supply from being turned back

on inadvertently.

•THIS APPLIANCE MUST BE GROUNDED. Failure to properly ground this

appliance could result in death, serious injury, re, or damage to the appliance.

For All Models:

•Donotsplash,pour,orspraywaterdirectlyontoorintotheappliance.Thismight

cause short circuit, electric shock, corrosion, or failure.

•Donotmakeanyalterationstotheappliance.Alterationscouldresultinelectric

shock, injury, re, or damage to the appliance.

•Thisapplianceisnotintendedforusebypersons(includingchildren)withreduced

physical, sensory, or mental capabilities, or lack of experience and knowledge,

unless they have been given supervision or instruction concerning use of the

appliance by a person responsible for their safety.

•Childrenshouldbeproperlysupervisedaroundthisappliance.

•Donotclimb,stand,orhangontheapplianceordoorsorallowchildrenor

animals to do so. Do not climb into the appliance or allow children or animals to

do so. Death or serious injury could occur or the appliance could be damaged.

•Becarefulnottopinchngerswhenopeningandclosingthedoors.Becareful

when opening and closing the doors when children are in the area.

WARNING, continued

•Openandclosethedoorswithcare.Doorsopenedtooquicklyorforcefullymay

cause injury or damage to the appliance or surrounding equipment.

•Donotusecombustiblesprayorplacevolatileorammablesubstancesnearthe

appliance. They might catch re.

•Keeptheareaaroundtheapplianceclean.Dirt,dust,orinsectsintheappliance

could cause harm to individuals or damage to the appliance.

•Donottightlypackthecabinet.Allowsomespacebetweenitemstoensuregood

airow.Alsoallowspacebetweenitemsandinteriorsurfaces.

•Donotthrowanythingontotheshelvesorloadanysingleshelfwithmorethan

120lb. (54.5 kg) of product. They might fall off and cause injury.

•Thisapplianceisdesignedonlyfortemporarystorageoffood.Employsanitary

methods. Use for any other purposes (for example, storage of chemicals or

medical supplies such as vaccine and serum) could cause deterioration of stored

items.

•Donotblockairinletsoroutlets,otherwisecoolingperformancemaybereduced.

•Donotputwarmorhotfoodsinthecabinet.Letthemcoolrst,ortheywillraise

the cabinet temperature and could deteriorate other foods in the cabinet or

overload the appliance.

•Allfoodsshouldbewrappedinplasticlmorstoredinsealedcontainers.

Otherwise foods may dry up, pass their smells onto other foods, cause frost

to develop, result in poor appliance performance, or increase the likelihood of

cross-contamination. Certain dressings and food ingredients, if not stored in

sealed containers, may accelerate corrosion of the evaporator, resulting in failure.

•Donotstoreitemsnearairoutlets.Otherwise,itemsmayfreezeupandcrackor

break causing a risk of injury or contamination of other food.

NOTICE

•Protecttheoorwhenmovingtheappliancetopreventdamagetotheoor.

•Keepventilationopenings,intheapplianceenclosureorinthebuilt-instructure,

clear of obstruction. Do not place anything on top of the appliance. Blockage of

airowcouldnegativelyaffectperformanceanddamagetheappliance.

•Topreventdeformationorcracks,donotsprayinsecticideontotheplasticpartsor

let them come into contact with oil.

•Toavoiddamagetothegasket,useonlythedoorhandlewhenopeningand

closing.

I. Specications

A. Electrical and Refrigerant Data

Design Pressure (PSIG) Refrigerant

Model AC Supply Voltage Amperes HI LO R-404A

RH1-SSB(-HD)(-CF) 115/60/1 7. 0 450 200 12.2 oz.

RH2-SSB(-HD) 115/60/1 10.0 450 200 18.2 oz.

RH3-SSB(-HD)(-FG)(-HG) 115/60/1 13.0 450 200 23.2 oz.

RH1-SSB-GD 115/60/1 10.7 450 200 16.1 oz.

RH2-SSB-GD 115/60/1 11. 8 400 200 21.5 oz.

RH3-SSB-GD 115/60/1 15.5 450 250 31.4 oz.

FH1-SSB(-HD) 115/60/1 11. 0 450 250 15.2 oz.

FH2-SSB(-HD) 115/60/1 15.5 450 250 20.1 oz.

FH2-SSB-HDCU 115/60/1 15.5 450 250 20.1 oz.

PTR1SSB-xxxx / PTR1SSB01-10 115/60/1 12.0 450 250 15.5 oz.

PTR2SSB-FSFS(-HSHS) 115/60/1 12.0 450 250 21.5 oz.

PTR2SSB-FGFG(-HGHG) 115/60/1 12.8 450 250 17.3 oz.

RIR1-SSB 115/60/1 7. 0 450 200 12.2 oz.

RIR2-SSB 115/60/1 11. 0 450 200 18.2 oz.

RIR2-SSB51-02 115/60/1 11. 0 450 200 18.2 oz.

RTR1-SSB 115/60/1 7. 0 450 200 12.2 oz.

Design Pressure (PSIG) Refrigerant

Model

Supply

Voltage Amperes

Refrigerator Freezer R-404A R-134a

HI LO HI LO Ref. Freezer Ref.

RFH1-SSB-HD 115/60/1 16.0 450 250 450 250 9.5 oz. 12.0 oz. -

RFH1-SSB(-HS)(-HSE) 115/60/1 9.5 240 120 450 250 - 12.1 oz. 9.1 oz.

RFH2-SSB(-HD) 115/60/1 16.6 450 200 450 250 12.2 oz. 15.2 oz. -

RFH3-SSB(-HD) 115/60/1 20 450 200 450 250 18.2 oz. 15.2 oz. -

See the nameplate for electrical and refrigeration specications. The nameplate is located

on the right side wall of the cabinet interior.

Note: We reserve the right to make changes in specications and design without prior

notice.

II. General Information

A. Construction

1. One Section

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Front Panel

Door

Door Lock

Door Gasket

Control Box

Power Switch

Perimeter Heater

Switch

Door Latch

Cabinet

Thermistor

Defrost

Thermistor

Evaporator Case Cover

Control Box Cover

Model Shown: RH1-SSB-FG

Light Switch

(glass door model)

Door Switch

Compressor

Thermostatic

Expansion Valve

2. Two Section

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Front Panel

Door

Door Lock

Door Gasket

Control Box

Power Switch

Thermostatic

Expansion Valve

Cabinet

Thermistor

Defrost

Thermistor

Evaporator Case Cover

Control Box Cover

Door Switch

Compressor

Model Shown: RH2-SSB

Perimeter Heater

Switch

3. Three Section

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Front Panel

Door

Door Lock

Door

Gasket

Control Box

Power Switch

Thermostatic

Expansion Valve

Cabinet

Thermistor

Defrost Thermistor

Evaporator Case Cover

Control Box Cover

Door Switch

Compressor

Model Shown: RH3-SSB-FG

Door Handle

Perimeter Heater

Switch

Light Switch

(glass door model)

4. Pass Thru

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Front Panel

Door

Door Lock

Door Gasket

Control Box

Power Switch

Thermostatic

Expansion Valve

Cabinet

Thermistor

Defrost

Thermistor

Evaporator Case Cover

Control Box Cover

Door Switch

Compressor

Model Shown: PTR2SSB-FGFG

Perimeter Heater

Switch

Light Switch

(glass door

model)

5. Roll-In

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Front Panel

Door

Door Lock

3-Sided

Door Gasket

Control Box

Power Switch

Thermostatic

Expansion Valve

Cabinet

Thermistor

Evaporator Case Cover

Control Box Cover

Door Switch

Compressor

Model Shown: RIR1-SSB

Rack

Guide

Ramp

Perimeter Heater

Switch

Sweep

Gasket

6. Roll Thru

Evaporator

Fan Motor

Evaporator

Control Board

Condenser Fan Motor

Condenser

Condenser Air Filter

Display Board

Top Cover

Rear Panel

Door

Door Lock

Door

Gasket

Control Box

Power Switch

Thermostatic

Expansion Valve

Cabinet

Thermistor

Evaporator Case Cover

Control Box Cover

Door Switch

Compressor

Model Shown: RTR1-SSB

Front Panel

Rack

Guide

Ramp

Perimeter Heater

Switch

B. Sequence of Operation

1. Sequence Cycles and Shutdown

The steps in the sequence are as outlined below. When power is supplied and the power

switchisinthe"ON"position,CBred"POWEROK"LEDcomesonandCBrevision

(r##) appears on DB.

Note: There is a minimum 2.5-minute Comp on time and 2.5-minute Comp off time.

RFH1-SSB(-HS)(-HSE): Power is supplied to CPM as soon as the power switch is

placedinthe"ON"position.F/ScontrolsCPMoperation.

a) Refrigerator and RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator

1) Startup

No Component LEDs are on. LED 3 (EvapFM on) is off: EvapFM energizes.

2.5-minute Comp delay timer starts. Cabinet temperature appears on DB.

Note: EvapFM energizes at startup and runs continuously, de-energizing for open doors

only.

2a) Cool Down–Refrigerator

LEDs 4 (Comp) and 5 (ConFM) are on: EvapFM continues. 2.5-minute Comp delay

timer terminates. Comp and ConFM energize. 2.5 min. Comp minimum run timer

starts.

2b) Cool Down–RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator

LEDs 4 (Comp and ConFM) and 5 (unused) are on: EvapFM continues. 2.5 minute

Comp delay timer terminates. Comp and ConFM energize. 2.5 min. Comp minimum

run timer starts.

3) Cool Down Achieved

No Component LEDs are on. LED 3 (EvapFM on) is off: CB monitors cooling of the

cabinet via CTh. CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues, Comp

and ConFM de-energize. 2.5 min. Comp minimum off timer starts.

4a) Cool Down Restart–Refrigerator

LEDs 4 (Comp) and 5 (ConFM) are on: CTh warms to 3°F (1.7°C) above setpoint.

EvapFM continues, Comp and ConFM energize. 2.5 min. Comp minimum run timer

starts.

4b) Cool Down Restart–RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator

LEDs 4 (Comp and ConFM) and 5 (unused) are on: CTh warms to 3°F (1.7°C)

above setpoint. EvapFM continues, Comp and ConFM energize. 2.5 min. Comp

minimum run timer starts.

5) Defrost

A1. Temperature-Initiation

1) Refrigerator–LED5(ConFM) is on. LED 3 (EvapFM on) is off: DTh cools to

13°F (-10°C) (8°F (-13°C) for Pass-Thrus). 20 min. minimum off cycle defrost

starts. Cabinettemperature displayed on DB. EvapFM continues. ConFM

continues or energizes.

2) RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator–LED 5 (unused) is on.

LED3(EvapFM on) is off: DTh cools to 13°F (-10°C). 20 min. minimum off

cycle defrost starts. Cabinet temperature displayed on DB. EvapFM continues.

Comp and ConFM de-energize.

A2. Time-Initiation

If the factory time-initiated setting is moved from 0defrosts per 24 hours, the

appliance enters the defrost cycle when the time of the new setting terminates.

Defrost timerterminates, CB initiates defrost. Defrost sequence same as

"5)A1.Temperature-Initiation"above.

B. Defrost Termination

1) Refrigerator–LEDs4(Comp) and 5(ConFM) are on. LED 3 (EvapFM on) is

off: DTh warms to 40

°F (4°C). EvapFM and ConFM continue. 2.5 minute Comp

delay timer terminates. Comp energizes.

2) RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator–LEDs 4 (Comp and ConFM) and

5 (unused) are on. LED 3(EvapFM on) is off: DTh warms to 40

°F (4°C).

EvapFM continues. 2.5 minute Comp delay timer terminates. Comp and ConFM

energize.

Note:

•Perimeterheatercontrolledbyperimeterheaterswitch.

•Glassdoor(-GDmodels)heatercontrolledbyglassdoorheaterswitch.

•CPMRFH1-SSB(-HS)(-HSE)Refrigerator:CPMhaspowersupplyassoonasthe

powerswitchisplacedinthe"ON"position.CPMoperatesasneededviatheoat

switch.

Legend: CB–control board; Comp–compressor; ConFM–condenser fan motor;

CPM–condensate pump motor (RFH1-SSB(-HS)(-HSE) Refrigerator); CTh–cabinet

thermistor; DB–display board; DTh–defrost thermistor; EvapFM–evaporator fan

motor; F/S–oatswitch

b) Freezer and RFH1-SSB(-HD)(-HS)(-HSE) Freezer

1a) Startup: Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)(-HSE) Freezer

LED 3 (EvapFM off) is on: 2.5-minute Comp delay timer starts. Cabinet temperature

appears on DB.

1b) Startup: Freezer (auxiliary code P-6 and later) and RFH1-SSB-HD Freezer

No Component LEDs are on. LED 3 (EvapFM on) is off: EvapFM energizes.

2.5-minute Comp delay timer starts. Cabinet temperature appears on DB.

Note: Evaporator Fan Motor Operation (LED 3 EvapFM): LED3 is off when EvapFM is

on and LED 3 is on when EvapFM is off.

S3 dip switch 7 or 8 in the "OFF" position: All freezers (auxiliary code

P-5and earlier) and RFH1-SSB(-HS)(-HSE) freezer, EvapFM energizes with

Comp and cycles on and off with Comp. EvapFM de-energizes when door is

open.

S3 dip switch 7 or 8 in the "ON" position: All freezers (auxiliary code

P-6and later) and RFH1-SSB-HD freezer, EvapFM energizes at startup and

runscontinuously,de-energizingfordefrostandopendoorsonly.See"II.E.4.g)

FreezerEvaporatorFanOperation(exceptRFH1)(S3dipswitch7)"and

"II.E.4.h)RFH1FreezerEvaporatorFanMotorandHeaters(S3dipswitch8)."

Dip switch 8 is only used on RFH1-SSB-HD model.

2a) Cool Down: Freezer (auxiliary code P-5 and earlier)

LEDs 4 (Comp) and 5 (ConFM) areon. LED 3 (EvapFM on) is off: 2.5-minute Comp

delay timer terminates. Comp, ConFM, and EvapFM energize.

2b) Cool Down: Freezer (auxiliary code P-6 and later)

LEDs 4 (Comp) and 5 (ConFM) are on. LED 3 (EvapFM on) is off: 2.5-minute Comp

delay timer terminates. EvapFM continues. Comp and ConFM energize.

2c) Cool Down: RFH1-SSB-HD Freezer

LED 4 (Comp and ConFM) is on. LED 3 (EvapFM on) is off: 2.5-minute Comp delay

timer terminates. EvapFM continues. Comp and ConFM energize.

2d) Cool Down: RFH1-SSB(-HS)(-HSE) Freezer

LEDs 4 (Comp and ConFM) and 5 (DrH, PH, and MH) areon. LED 3 (EvapFM on)

is off: 2.5-minute Comp delay timer terminates. Comp, ConFM, EvapFM, DrH, PH,

and MH energize. 2.5 min. Comp minimum run timer starts.

3a) Cool Down Achieved: Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)

(-HSE) Freezer

LED 3 (EvapFM off) is on: CB monitors cooling of the cabinet via CTh. CTh cools to

°F (1.7°C) below setpoint. Comp, ConFM, and EvapFM de-energize. DrH, PH, and

MH de-energize(RFH1-SSB(-HS)(-HSE)).

3b) Cool Down Achieved: Freezer (auxiliary code P-6 and later)

No Component LEDs are on. LED 3 (EvapFM on) is off: CB monitors cooling of the

cabinet via CTh. CTh cools to 3°F (1.7°C) below setpoint. EvapFM continues. Comp

and ConFM de-energize.

3c) Cool Down Achieved: RFH1-SSB-HD Freezer

LED 5 (CPH and DrH (auxiliary code Q-5 and later)) is on. LED 3 (EvapFM on)

is off: CB monitors cooling of the cabinet via CTh. CTh cools to 3

°F (1.7°C) below

setpoint. EvapFM continues. Comp and ConFM de-energize. CPH and DrH (auxiliary

code Q-5 and later) energize.

4a) Cool Down Restart: Freezer (auxiliary code P-5 and earlier)

LEDs 4 (Comp) and 5 (ConFM) are on. LED 3 (EvapFM on) is off: CThwarms

to 3°F (1.7°C) above setpoint. 2.5-minute Comp off delay timer terminates. Comp,

ConFM, and EvapFM energize.

4b) Cool Down Restart: Freezer (auxiliary code P-6 and later)

LEDs 4 (Comp) and 5 (ConFM) are on. LED 3 (EvapFM on) is off: CTh warms

to 3°F (1.7°C) above setpoint. 2.5-minute Comp off delay timer terminates. EvapFM

continues. Comp and ConFM energize.

4c) Cool Down Restart: RFH1-SSB-HD Freezer

LEDs 4 (Comp and ConFM) and 5 (CPH and DrH (auxiliary code Q-5 and later))

are on. LED 3 (EvapFM on) is off: CTh warms to 3°F (1.7°C) above setpoint.

2.5-minute Comp off delay timer terminates. EvapFM, CPH, and DrH (auxiliary code

Q-5 and later) continue. Comp and ConFM energize.

4d) Cool Down Restart: RFH1-SSB(-HS)(-HSE) Freezer

LEDs 4 (Comp and ConFM) and 5 (DrH, PH, and MH) are on. LED 3 (EvapFMon)

is off: CTh warms to 3°F (1.7°C) above setpoint. 2.5-minute Comp delay timer

terminates. Comp, ConFM, EvapFM, DrH, PH and MH energize.

5a) Defrost: Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)(-HSE) Freezer

(1) Time-Initiated Defrost or Manual-Initiated Defrost

a1) Freezer (auxiliary code P-5 and earlier)–LEDs 1 (DH) and 3(EvapFM

off) are on: DT terminates or manual defrost initiated. 20-minute minimum

defrost timer starts. 1-hour maximum defrost timer starts. DH energizes.

"dEF"displayedonDB.Ifenergized, Comp, ConFM, and EvapFM de-energize.

a2) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 1 (DH) and 3(EvapFM off) are on:

DTterminates or manual defrost initiated. 20-minute minimum defrost timer

starts. 1-hour maximum defrost timer starts. DH energizes. "dEF"displayedon

DB. Ifenergized, Comp, ConFM, and EvapFM de-energize. DrH, PH, and MH

de-energize.

The time-initiated defrost is factory set to 6 times per day (every 4 hours. For

furtherdetails,see"II.E.1.b)DefrostFrequency."Beforechangingthissetting,

contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations.

(2) Defrost Termination: Defrost Recovery Step 1

a1) Freezer (auxiliary code P-5 and earlier)–LEDs 4 (Comp) and 5(ConFM)

are on. LED 3 (EvapFM on) is off: DTh warms to 100°F (38°C) or 1-hour

defrost timer terminates. DHde-energizes. 5-minutes later, Comp and ConFM

energize.

a2) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM) and 5 (DrH,

PH, and MH) are on: DThwarms to 100°F (38°C) or 1-hour defrost timer

terminates. DH de-energizes. 5-minutes later, Comp, ConFM, DrH, PH, and

MH energize.

(3) Defrost Termination: Defrost Recovery Step 2

a1) Freezer (auxiliary code P-5 and earlier)– LEDs 4 (Comp) and 5(ConFM)

are on. LED 3 (EvapFM on) is off: DTh cools to 70°F (21°C) or lower,

EvapFM energizes.

a2) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM) and 5 (DrH,

PH, and MH) are on. LED 3 (EvapFM) is off: DTh cools to 70°F (21°C) or

lower, EvapFM energizes.

(4) Defrost Completiton

a1) Freezer (auxiliary code P-5 and earlier)–LEDs 4 (Comp), and 5 (ConFM)

are on. LED 3 (EvapFM on) off: When CTh reads 15°F (8.3°C) above

setpoint or less, cabinet temperature is displayed on DB. Defrost is complete.

a2) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM), and 5 (DrH,

PH, and MH) are on. LED 3 (EvapFM on) off: When CTh reads 15°F (8.3°C)

above setpoint or less, cabinet temperature is displayed on DB. Defrost is

complete.

5b) Defrost: Freezer (auxiliary code P-6 and later) and RFH1-SSB-HD Freezer

(1) Time-Initiated Defrost or Manual-Initiated Defrost

a1) Freezer (auxiliary code P-6 and later)–LEDs 1 (DH, DrH, DctH, and CordH)

and 3(EvapFM off) are on: DT terminates or manual defrost initiated.

20-minute minimum defrost timer starts. 1-hour maximum defrost timer starts.

DH,DrH,DcTH,andCordHenergize."dEF"displayedonDB.Ifenergized,

Comp, ConFM, and EvapFM de-energize.

a2) RFH1-SSB-HD Freezer–LEDs 1 (DH), 3(EvapFM off), and 5 (CPH and

DrH (auxiliary code Q-5 and later)) are on: DT terminates or manual

defrost initiated. 20-minute minimum defrost timer starts. 1-hour maximum

defrost timer starts. CPH and DrH (auxiliary code Q-5 and later)continue. DH

energizes."dEF"displayedonDB.Ifenergized,Comp,ConFM,andEvapFM

de-energize.

The time-initiated defrost is factory set to 6 times per day (every 4 hours). For

furtherdetails,see"II.E.1.b)DefrostFrequency."

Before changing this setting, contact Hoshizaki Technical Support at

1-800-233-1940 for recommendations.

Note: Some models may utilize any combination of the following heaters during defrost:

DuctHeater,CordHeater,orDrainHeater.See"VII.WiringDiagrams"forspecic

model details.

(2) Defrost Termination: Defrost Recovery Step 1

a1) Freezer (auxiliary code P-6 and later)–LEDs 3(EvapFM off), 4 (Comp),

and 5(ConFM) are on: DTh warms to 100

°F (38°C) or 1-hour defrost timer

terminates. DH de-energizes. 5-minutes later, Comp and ConFM energize.

a2) RFH1-SSB-HD Freezer–LEDs 3(EvapFM off), 4 (Comp and ConFM), and

5(CPH and DrH (auxiliary code Q-5 and later)) are on: DTh warms to

100°F (38°C) or 1-hour defrost timer terminates. DH de-energizes. 5-minutes

later, Comp and ConFM energize. CPH and DrH(auxiliary code Q-5 and later)

continue.

(3) Defrost Termination: Defrost Recovery Step 2

a1) Freezer (auxiliary code P-6 and later)–LEDs 4 (Comp) and 5(ConFM) are

on. LED 3 (EvapFM on) is off: DTh cools to 70°F (21°C) or lower, EvapFM

energizes.

a2) RFH1-SSB-HD Freezer–LEDs 4 (Comp and ConFM) and 5 (CPH and DrH

(auxiliary code Q-5 and later)) are on. LED 3(EvapFM on) is off: DTh cools

to 70°F (21°C) or lower, EvapFM energizes.

(4) Defrost Completion

1a) Freezer (auxiliary code P-6 and later)–LEDs 4 (Comp) and 5(ConFM) are

on. LED 3 (EvapFM on) is off: When CTh reads 15°F (8.3°C) above setpoint

or less, cabinet temperature is displayed on DB. Defrost is complete.

1b) FH1-SSB-HD Freezer–LEDs 4 (Comp and ConFM) and 5 (CPH and DrH

(auxiliary code Q-5 and later)) are on. LED 3(EvapFM on) is off: When

CTh reads 15°F (8.3°C) above setpoint or less, cabinet temperature is

displayed on DB. Defrost is complete.

Legend: CB–control board; Comp–compressor; ConFM–condenser fan motor; CordH–cord

heater; CPH–condensate pan heater; CTh–cabinet thermistor; DB–display board;

DctH–duct heater; DH–defrost heater; DrH–drain heater; DT–defrost timer;

DTh–defrost thermistor; EvapFM–evaporator fan motor; MH–mullion heater;

PH–perimeter heater

2. Sequence Flow Chart

a) Refrigerator

DTh cools to 13°F

(-10°C) (8°F (-13°C)

for Pass Thru) or

optional defrost timer

terminates

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DTh-defrost thermistor

EvapFM-evaporator fan motor

2. Cool Down

3. Cool Down Achieved

Comp energized

ConFM energized

EvapFM energized

CTh in control

CTh cools

to 3°F (1.7°C)

below setpoint

CTh warms

to 3°F (1.7°C)

above setpoint

5. Defrost

EvapFM energized

Comp de-energized

ConFM de-energized

DTh warms to

40°F (4°C)

2.5-min.

Comp delay

timer starts

Note:

•2.5-minuteminimumcompressoronandofftime.

•Evaporatorfanmotorde-energizeswhendoorisopen.

•20-minuteminimumdefrosttime.

•Perimeterheatercontrolledbyperimeterheaterswitch.

•Glassdoor(-GDmodels)heatercontrolledbyglassdoor

heater switch.

•RFH1-SSB(-HS)(-HSE):Condensatepumpmotorhas

power supply as soon as the power switch is placed in

the"ON"position.Condensatepumpmotorenergizesas

neededviatheoatswitch.

DTh in control

ConFM energized

EvapFM energized (except RFH1)

Comp de-energized

EvapFM energized

2.5-min. Comp on

timer starts

4. Cool Down Restart

2.5 min.

Comp Delay

"RI-A" Control Board

Refrigerator Sequence Flow Chart

2.5-min. Comp off

timer starts

1. Startup

b) Freezer

Defrost timer terminates

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DB-display board

DH-defrost heater

DTh-defrost thermistor

EvapFM-evaporator fan motor

2. Cool Down

3. Cool Down Achieved

Comp energized

ConFM energized

EvapFM energized

CTh in control

2.5 min.

Comp Delay

CTh cools

to 3°F (1.7°C)

below setpoint

CTh warms

to 3°F (1.7°C)

above setpoint

5. Defrost

EvapFM energized

(if dip switch 7 or 8 on)

Comp de-energized

ConFM de-energized

EvapFM de-energized

(if dip switch 7 and 8 off)

DTh warms to

100°F (38°C)

Note:

•2.5-minuteminimumcompressoronandofftime.

•Evaporatorfanmotorde-energizeswhendoorisopen.

•20-minuteminimumdefrosttime.

•1-hourmaximumdefrosttime.

•Perimeterheatercontrolledbyperimeterheaterswitch

(except RFH1-SSB(-HS)(-HSE)).

•Glassdoor(-GDmodels)heatercontrolledbyglassdoor

heater switch.

•RFH1-SSB(-HS)(-HSE):Perimeterheaterandmullionheater

are controlled through the control board and turn on and off

with compressor when S3 dip switch 8 is in the off position.

•Modelsmayutilizeanycombinationofthefollowingheaters:

Condensate Pan Heater, Cord Heater, Drain Heater, Duct

Heater,andGlassTubeHeater.See"VII.WiringDiagrams"

for specic model details.

DTh in control

DH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

EvapFM energized

(if dip switch 7 or 8 on)

2.5-min. Comp

on timer starts

4. Cool Down Restart

DH de-energized

5-min. delay timer starts

after defrost heater

de-energizes

6. Cabinet Cool Down Defrost Recovery (Drip Time)

to 6 below

from 5 above

Comp energized

ConFM energized

Evaporator temperature

drops below 70°F (21°C)

Displaychangesfrom"dEF"

on DB to cabinet temperature

when CTh drops to 15°F

(8.3°C) or less above setpoint.

To 2 above

2.5-min. Comp off

timer starts

"RI-A" Control Board

Freezer Sequence Flow Chart

Comp energized

ConFM energized

EvapFM energized

DTh at or above

100°F (38°C)

1. Startup

from 6 below

DH de-energized

C. Display Board

1. Location

Whenthepowerswitchismovedtothe"ON"position,thecontrolboardrevision

appearsonthedisplayboard."r##"indicatesthecontrolboardrevisionlevel(e.g.,r23).

Afterward, the cabinet temperature is displayed. The display board also allows for access

to the guarded access menu and service menu. From the guarded access menu, the

cabinet setpoint, defrost frequency, and temperature display scale can be adjusted. For

furtherdetails,see"II.E.1.GuardedAccessMenu."Fromtheservicemenu,information

regardingappliancefunctionscanbeobtained.Forfurtherdetails,see"II.E.2.Service

Menu."

2. Display Board Layout

Ribbon Cable Connector

LED Display

Up and Down Buttons

"ENTER"Button

"RESET"Button

P/N 2A0883-01

Front Panel

Display Board

Door

Up and Down

Buttons

Display

Board

"RESET"Button:

Temporarily silences

audible alarms

"TempGuard"on

Earlier Models

D. Control Board

•AHoshizakiexclusivecontrolboardisemployedinHoshizakiProfessionaland

TempGuard Series refrigerators and freezers.

•Allmodelsarepretestedandfactory-adjusted

•Foracontrolboardcheckprocedure,see"III.B.ControlBoardCheck."

NOTICE

•Thecontrolboardisfragile;handleverycarefully.

•Thecontrolboardcontainsintegratedcircuits,whicharesusceptibletofailure

due to static discharge. It is especially important to touch the metal part of the

appliance before handling or replacing the control board.

•Donottouchtheelectronicdevicesonthecontrolboardorthebackofthecontrol

board.

•Donotchangewiringandconnections.Donotmisconnectterminals.

•Donotshortoutpowersupplytotestforvoltage.

•Alwaysreplacethewholecontrolboardassemblyifitgoesbad.

•Keepthethermistor,cloggedlter,doorswitch,andhigh-pressureswitchleads

andribboncableatleast11/2"awayfromhighvoltageleads(100VACormore)

to protect against electrical noise.

1. Location

The control box, control panel, and error code label are located behind the front

panel. There are two front panel designs. If the front panel swings up when pulled out,

swing the panel up and allow both panel hinges to catch securely on both sides of

the side panel frame (one on each side). Otherwise, remove the panel by lifting it up

approximately one-half inch, then pulling it forward.

Pull Forward

Push Up

Front Panel

Locking Collar

Rotate

"RI-A" Control Board

Relay LED Component Energized

LED

ON/OFF

X1 1 Defrost Heater (Freezer) ON

X2 2 Cabinet Light ON

X3 3 Evaporator Fan Motor OFF

X4 4 Compressor Relay ON

X5 5 Condenser Fan Motor

Condensate Pan Heater (RFH1)

.CNI฀STCUDORP฀LORTNOC

71355฀฀.NM฀,silopaenniM

:฀EMAN

:฀ETAD

:฀ELTIT

฀:฀#฀GwD

:VER฀GWD

:฀VER฀BCP

FJT

฀:฀ETAD฀.VER

50/02/21

DL฀32-2682A2-SOH฀,ACP

21008823

:฀ETAD฀VER

50/02/21

•K9 Connector (115VAC)

#3 115VAC power supply

(black)

#2 Refrigerator and

Freezer: Condenser

Fan Motor (brown)

RH3-SSB-FG(-HG)

(aux. code A-5 and later) :

Perimeter and Mullion

Heaters (brown)

RFH1-SSB-HD Freezer:

Condensate Pan

Heater (brown)

RFH1-SSB-HD Freezer

(aux. code Q-5 and later):

Condensate Pan

Heater and Drain Heater

(brown)

RFH1-SSB(-HS)(-HSE)

Freezer:

Drain Heater, Perimeter

Heater, and Mullion Heater

(brown)

• K1 Connector (115VAC)

#1 Power Switch Input

(black)

#2 Open

#3 Evaporator Fan Motor

(dark blue)

#4 Open

#5 Cabinet Light

(light blue)

Door Heater

(RH_-SSB-GDfreezer)

#6 Defrost Heater (freezer)

Models may utilize any

combination of the following

additonal heaters: Cord Heater,

Drain Heater, Duct Heater, and

Glass Tube Heater.

See"VII.WiringDiagrams"for

specic model details.

#7 Open

#8 Open

#9 Power Switch Input

(black)

#10 Compressor Relay

(gray)

• K5 Connector (5VDC)

Open

• K4 Connector (5VDC)

Cabinet Thermistor (gray)

• K3 Connector (5VDC)

Defrost Thermistor (orange)

•S1 "ALARM RESET" Button

•S2 "OUTPUT TEST" Button

•K2 Connector

Control Transformer

(10VAC)

•K7 Connector

Display Cable

S3 Dip Switch

X3X2

•LED 5 (X5 Relay)

Condenser Fan Motor

Condensate Pan Heater (RFH1)

•LED 4 (X4 Relay)

Compressor Relay

•LED 1 (X1 Relay)

Defrost Heater (Freezer)

•LED 2 (X2 Relay)

Cabinet Light

• LED 3 (X3 Relay)

Evaporator Fan Motor

(Off when Evaporator Fan Relay Energizes)

•K6 Connector (5VDC)

#1 Open

#2 & #3 Clogged Filter Thermostat

(pink) (Normally Open)

#4 & #5 Cabinet Light

(light blue) (Normally Closed)

#6 & #7 High Pressure Switch

(violet) (Normally Closed)

#1 Control Transformer

(10VAC) (red)

2. Control Board Layout

• "POWER OK" LED (red)

(lights when 10VAC is

supplied to K2 connector)

"RI-A" Control Board

Part Number 2A2862-24

#2 Control Transformer

(10VAC) (red)

E. Controls and Adjustments

1. Guarded Access Menu

Three settings can be viewed and adjusted from this menu: temperature setpoint, defrost

frequency, and temperature display scale. To enter the guarded access menu, press

and hold the up and down buttons simultaneously for 3 seconds. The current setpoint

temperature is displayed.

a) Temperature Setpoint

The refrigerator factory default setting is 36°F (2°C).

The freezer factory default setting is -3°F (-19°C).

The temperature setpoint is the value for the average cabinet temperature. The

temperature differential for the compressor to turn on and off is ±3°F of the setpoint. For

example, setpoint = 36°F, compressor on at 39°F, compressor off at 33°F. If necessary,

adjust the setpoint temperature as follows:

1) Press and hold the up/down arrows simultaneously for 3 seconds. The current setpoint

temperature will be displayed.

2) To change the setpoint, press the up/down arrows until the desired value is displayed.

For refrigerators the cabinet temperature is adjustable between 36°F and 50°F

(2°Cand 10°C). The factory default is 36°F (2°C). For freezers the cabinet temperature

is adjustable between -10°F and 25°F (-23°C and -3°C). The factory default is -3°F

(-19°C).

3)Tosavethevalue,press"ENTER"repeatedlyuntilyouhavecycledthroughthemenu

and the appliance returns to the normal display mode. If you do not cycle through the

menu and no button is pressed in 15 seconds, the display will return to normal and the

setpoint will remain unchanged.

b) Defrost Frequency

(1a) Defrost for Refrigerators - Control Board Revision 22 and earlier

This appliance uses an off-cycle defrost. When a sensor in the evaporator coil reaches

13°F (-10°C) (8°F, (-13°C) for Pass Thru) the appliance enters defrost. When the sensor

reaches 40°F (4°C) the appliance ends defrost. No adjustment is available or needed

from the control board.

The cabinet temperature is displayed, even during defrost.

(1b) Defrost for Refrigerators - Control Board Revision 23 and later

This appliance uses an off-cycle defrost. When a sensor in the evaporator coil reaches

13°F (-10°C) (8°F, (-13°C) for Pass Thru) the appliance enters defrost. When the sensor

reaches 40°F (4°C) the appliance ends defrost. The cabinet temperature is not displayed

duringdefrost,"dEF"isdisplayedinitsplace.Thisrevisionalsofeatureanadjustable

time-initiated defrost along with the normal temperature-initiated defrost.

The time-initiated defrost is factory set at 0. Before changing this setting, contact

the Hoshizaki Technical Support Department for recommendations. To change the

time-initiateddefrost,followthestepsin"(3)DefrostFrequencyAdjustment"laterinthis

section.

(2) Defrost for Freezer

This appliance uses a time-initiated heated defrost. It is preset at the factory to defrost

6times per day for general conditions. However, if it is determined that this interval

doesnotsuitconditions,theintervalcanbechanged.Tochange,see"(3)Defrost

FrequencyAdjustment"below.ContacttheHoshizakiTechnicalSupportDepartmentfor

recommendations. Note that since the defrost is heated, it will have a tendency to raise

cabinet temperature. Defrost termination temperature is 100°F (38°C).

Duringfreezerdefrost,thecabinettemperatureisnotdisplayed,"dEF"isdisplayedinits

place.

(3) Defrost Frequency Adjustment

1)Pressandholdtheup/downarrowssimultaneouslyfor3seconds.Press"ENTER"until

"dF"isdisplayed.

2) To change the time-initiated defrost frequency, press the up/down arrows until the

desired value is displayed. For refrigerators (control board revision 23 and later), the

defrost frequency is adjustable between 0 and 12 defrosts per 24 hours. For freezers,

the defrost frequency is adjustable between 1 and 12 defrosts per 24 hours. The factory

default for refrigerators is 0 and the factory default for freezers is 6.

3)Tosavethevalue,press"ENTER"repeatedlyuntilyouhavecycledthroughthemenu

and the appliance returns to the normal display mode. If you do not cycle through the

menu and no button is pressed in 15 seconds, the display will return to normal and the

defrost frequency will remain unchanged.

Note: The change in the defrost setting will take effect after the next defrost based on

the previous setting. If it is desired that this change in interval timing take effect

immediately, turn the appliance off and back on. The next time-initiated defrost

willtakeeffect"x"hoursafterpowerisresupplied.Forexample,ifthesettingis

dF 6, x=4 and the next defrost will take place 4 hours from the time that power is

applied.

Primary defrost termination is controlled by the defrost thermistor. However, two

additional safeties are also present:

•TimeTermination-1hourmaximum

•TemperatureTermination-Measuredbyaseparatedevicethatisin-linewiththe

heaters and independent of the control board

c) Temperature Display Scale (°F or °C)

To change the display scale, follow the steps below.

1)Pressandholdtheup/downarrowssimultaneouslyfor3seconds.Press"ENTER"until

"F"or"C"temperaturedisplayscaleisdisplayed.

2) To change the temperature display, press the up/down arrows until the desired scale is

displayed.Thefactorydefaultis"F".

3)Press"ENTER"tosavethevalueandreturntonormaldisplaymode.Ifyoudonotpress

"ENTER"andnobuttonispressedin15seconds,thedisplaywillreturntonormaland

the temperature display scale will remain unchanged.

2. Service Menu

From the service menu, information regarding the functioning of the appliance can be

obtained. To access the service menu, press and hold the up and down buttons and

the"ENTER"buttonsimultaneouslyfor3seconds.Scrollthroughtheservicemenulist

usingthe"ENTER"button.Changeoptionsusingtheup/downarrows.Toexit,pressthe

"ENTER"buttonuntilnormaldisplaymodereturns.Toexittheservicemenuatanypoint,

pressandholdthe"ENTER"buttonfor3secondsortheservicemenudisplayremains

on the display board for 10 minutes after the last keystroke, then automatically reverts

to normal operation (cabinet temperature display). All information given in degrees

automatically displays in the current selected scale (°F or °C).

Display Denition

1OFF Displays cabinet temperature.

1 ON Displays evaporator temperature. Display will automatically revert to cabinet sensor after ve minutes.

2OFF

(Freezer

Only)

Manual defrost initiation option not activated.

2 ON

(Freezer

Only)

Manual defrost initiation option activated. Control will begin defrost cycle when user returns to operating

mode by cycling through menus. Manual defrost does not eliminate or change times on any scheduled

defrost cycles.

3OFF Unconditional alarm reset option not activated.

3 ON

Unconditional alarm reset option activated. Changing from 3OFF to 3 ON resets all alarm display codes

simultaneously. This is a complete clearing of alarms.

4 16

Right two digits represent compressor run time in last 24 hours to the nearest hour. Example: 16 hours total

run time in the last 24 hours. Value is every 24 hours.

5 50

Right two digits represent compressor on time percentage for the last 5 run cycles. A run cycle begins when

the compressor switches from off to on and ends the next time it switches from off to on. (See diagram

below). Example: 50% run time over the last 5 run cycles.

Value is calculated as follows: Percent on time = On time last 5 cycles/total time last 5 cycles. Value is saved

every 5 cycles.

Note:"Ontimelast5cycles"doesnotincludeanontimethatwasterminatedbyadefrostcycleortherst

ontimeafteradefrost,and"Totaltimelast5cycles"doesnotincludeanonorofftimethatwasterminated

by a defrost cycle, the time spent in defrost, or the rst on time after a defrost.

6 45

Right two digits represent compressor run time for the last run cycle. Example: 45 minutes of compressor

run time in last run cycle.

7 45

(Freezer

Only)

Right two digits represent length of time for the last defrost cycle in minutes. Example: 45 minutes in last

defrost cycle.

8 67

Right two digits represent highest temperature recorded during the last high temperature alarm. Example:

Temperaturereached67degreesduringlasthightemperaturealarm.Displaywillshow"8--"iftherehasnot

been a high temperature alarm. Value is saved every 8.5 minutes when in alarm.

9-10

Right three places represent lowest temperature recorded during the last low temperature alarm. Example:

Temperaturereached-10degreesduringthelastlowtemperaturealarm.Displaywillshow"9--"iftherehas

not been a low temperature alarm. Value is saved every 8.5 minutes when in alarm.

3. LED Lights and Alarm Safeties Chart

If an error occurs, the alarm code and cabinet temperature are displayed in 2-second

intervals and an alarm sounds. See the table below for a description of the problem.

Alarm Signals

Alarm Code

Alarm

Sound Problem Reset Options

3 beeps

every ten

seconds

High Temperature Alarm

[Freezers with Control Board Revision

10and Earlier and All Refrigerators]

Cabinet temperature has exceeded set

temperature by 10°F (5.6°C) for more than

2hours.

[Freezers with Control Board Revision

11and Later]

Cabinet temperature has exceeded set

temperature by 25°F (14°C) for more than

4hours.

(When the appliance is turned on, the rst

displayreads"r##",where"##"indicatesthe

control board revision.)

Press"RESET."Iftemperaturehasreturned

tosetpointrange,alarmwillstopand"E1"will

clear.

Iftemperatureisnotbackinrange,"RESET"

willsilencethealarmfor5minutes."E1"will

continuetoash.

4 beeps

every ten

seconds

Low Temperature Alarm

Cabinet temperature has remained below

setpoint by 8°F (4°C) for more than 1 hour.

Press"RESET."Iftemperaturehasreturned

tosetpointrange,alarmwillstopand"E2"will

clear.

Iftemperatureisnotbackinrange,"RESET"

willsilencethealarmfor5minutes."E2"will

continuetoash.

[Freezer Only]

(may alternate

with"dEF"

instead of

temperature)

5 beeps

every ten

seconds

Defrost Alarm

Defrost has taken longer than 1 hour. Control

board has terminated defrost.

Press"RESET."Alarmwillstopand"E3"will

clear.

If 4 consecutive defrosts take more than

1hour, a qualied service technician must be

called.

For the service tech to reset this alarm, press

"ALARMRESET"onthecontrolboarditself.

6 beeps

every ten

seconds

High-Pressure Alarm

Compressor discharge pressure is outside

normal operating range. High-pressure

switch has been triggered 3 or more times in

1 hour.

If the high-pressure switch trips 5 times in

1hour, compressor stops and will not restart.

Press"RESET."Ifhigh-pressureswitchresets

automatically,alarmwillstopand"E4"will

clear when high-pressure switch closes. After

5high-pressure switch trips, the alarm can be

silencedfor1hourbypressingthe"RESET".

For the service tech to reset this alarm, press

"ALARMRESET"onthecontrolboarditself.

8 beeps

every ten

seconds

High Voltage Alarm

Line voltage has been too high for at least

10 seconds. To protect the compressor, the

control board de-energizes the compressor.

Alarm automatically resets when acceptable

voltage is detected.

Press"RESET"tosilencealarmfor5minutes.

9 beeps

every ten

seconds

Low Voltage Alarm

Line voltage has been too low for at least

10 seconds. To protect the compressor, the

control board de-energizes the compressor.

Alarm automatically resets when acceptable

voltage is detected.

Press"RESET"tosilencealarmfor5minutes.

Alarm Signals

Alarm Code

Alarm

Sound Problem Reset Options

Constant

buzzer

Cabinet Thermistor Malfunction Alarm

Cabinet thermistor has failed.

Cabinet thermistor disconnected, shorted

or open. Check connection and continuity.

Reconnect or replace as needed. After

replacing cabinet thermistor, alarm resets.

Duringalarm,press"RESET"tosilence

buzzer for 5 minutes.

Refrigerator: Compressor cycles 5 min. on,

5min. off.

Freezer: Compressor cycles 10 min. on,

3 min. off.

Constant

buzzer

Defrost Thermistor Malfunction Alarm

Defrost thermistor has failed.

Defrost thermistor disconnected, shorted,

or open. Check connection and continuity.

Reconnect or replace as needed. After

replacing defrost thermistor, alarm resets.

Duringalarm,press"RESET"tosilence

buzzer for 5 minutes.

Refrigerator: Defrost cycles every 6 hr. and

terminates on cabinet thermistor

temperaturre. If cabinet

thermistor is also defective,

defrost last 45 min.

Freezer: Defrost cycles on programmed

defrost timed intervals and

terminates at 45 min.

E10

[Dual Temp

Models Only]

10 beeps

every ten

seconds

Communication Alarm

Freezer and refrigerator control boards not

communicating properly to control

compressor delay.

When communication is restored, alarm will

reset.

Duringalarm,press"RESET"tosilence

buzzer for 18 hours.

1 beep

every ten

seconds

Clogged Filter Alarm

Condenser lter needs cleaning.

Clean lter. Allow time for sensor to react, then

press"RESET."

Duringalarm,press"RESET"tosilence

buzzer for 2 hours.

If this alarm occurs frequently, discharge

temperature is consistently too high.

Failure to take action could result in

damage to the compressor.

door

[Except -GD

Models]

2 beeps

every ten

seconds

Display Only: Door open.

Both Display and Beeps: Door open longer

than 3 minutes.

Closedoor.Duringalarm,press"RESET"to

silence buzzer for 3 minutes.

Note:Movingthediagnosticmenuitem3to"ON"resetsallalarmsregardlessof

whether or not the setpoints are reached. This is a complete clearing of all

alarms.See"II.E.2.ServiceMenu"fordetails.

4. Default Dip Switch Settings

The S3 dip switch settings are factory-set to the following positions:

Refrigerator S3 Dip Switch

Model

S3 Dip Switch No.

1 2 *3 4 5 6 7 8

RH_-SSB(-HD)(-FG)(-HG)ON OFF OFF OFF OFF OFF OFF OFF

RH_-SSB-GDON ON OFF OFF OFF OFF OFF OFF

PTR1SSB-xxxx

PTR1SSB01-10

PTR2SSB-xxxx

ON OFF OFF ON OFF OFF OFF OFF

RIR_-SSB,RTR1-SSBON OFF OFF OFF OFF OFF OFF OFF

RIR2-SSB51-02 ON ON OFF OFF OFF OFF OFF OFF

Freezer S3 Dip Switch

Model

S3 Dip Switch No.

1 2 *3 4 5 6 7 8

FH_-SSB(-HD)Aux.CodeP-5andEarlierOFF OFF OFF OFF OFF OFF OFF OFF

FH_-SSB(-HD)Aux.CodeP-6andLaterOFF OFF OFF OFF OFF OFF ON OFF

Dual Temp S3 Dip Switch

Model

S3 Dip Switch No.

1 2 *3 4 5 6 7 8

RFH_-SSB(-HD)(-HS)(-HSE)RefrigeratorON OFF OFF OFF OFF ON OFF OFF

RFH1-SSB-HD Freezer OFF OFF OFF OFF OFF ON OFF ON

RFH1-SSB(-HS)(-HSE) Freezer OFF OFF OFF OFF OFF ON OFF OFF

RFH2-SSB(-HD) Freezer Aux. Code P-5 and Earlier OFF OFF OFF OFF OFF ON OFF OFF

RFH2-SSB(-HD) Freezer Aux. Code P-6 and Later OFF OFF OFF OFF OFF ON ON OFF

RFH3-SSB(-HD) Freezer Aux. Code P-5 and Earlier OFF OFF OFF OFF OFF ON OFF OFF

RFH3-SSB(-HD) Freezer Aux. Code P-6 and Later OFF OFF OFF OFF OFF ON ON OFF

*NOTICE! S3 Dip Switch 3: Used to accomodate a normally open or normally

closed door switch. Place in the "OFF" position for the newer square door

switch, part number 3A1386-01 or 3A1826-01. Place in the "ON" position for the

older round door switch, part number 4A0487-01.

Appliance Operation (Freezer/Refrigerator) (1)

Display Board Operation (5)

Door Switch Type (newer square rocker or older round plunger) (3)

Cabinet Light/Heated Glass Door (2)

Freezer Evaporator Fan Operation (except RFH1) (7)

Refrigerator Defrost Initiation Temperature (4)

Dual Temp Model (6)

Dual Temp Freezer Component Control (8)

S3 Dip Switch

1 2 3 4 5 6 7 8

a) Appliance Operation (Freezer/Refrigerator) (S3 dip switch 1)

This setting determines whether the control board operates in refrigerator mode or

freezer mode. It also determines the temperature setpoint range at which the appliance

operates.

Factory set, no adjustment required.

S3 Dip Switch Setting

Appliance

Operation

Temperature Setpoint Range Factory Default

No. 1

OFF Freezer -10°F to 25°F (-23°C to -3°C) -3°F (-19°C)

ON Refrigerator 36°F to 50°F (2°C to 10°C) 36°F (2°C)

b) Cabinet Light/Heated Glass Door (S3 dip switch 2)

Whenthecabinetlightoptionisselected(S3dipswitch2"OFF"),thecontrolboard

energizes the K1 connector pin #5 (LBU wire) and turns on the cabinet light (solid door

models) each time the door and door switch open.

Whentheheatedglassdooroptionisselected(S3dipswitch2"ON"),thecontrol

board energizes the K1 connector pin #5 (LBU wire) when the compressor is off, and

de-energizes when the compressor turns on.

Factory set, no adjustment required.

S3 Dip Switch Setting

Cabinet Light/Heated Glass Door

No. 2

OFF Cabinet Light

ON Heated Glass Door (-GD models)

c) Door Switch Type (S3 dip switch 3)

Hoshizaki has utilized both normally open and normally closed door switch contact

styles. S3 dip switch 3 is used to select the type of switch used on a particular model.

Factory set, no adjustment required.

S3 Dip Switch Setting

Door Switch Type (Rocker or Plunger)

No. 3

OFF Rocker Door Switch (square): Open Contacts when Doors are Open

ON Plunger Door Switch (round): Closed Contacts when Doors are Open

d) Refrigerator Defrost Initiation Temperature (S3 dip switch 4)

Refrigerators only. Pass Thru refrigerator models require a defrost initiation temperature

that is different from the reach-in refrigerator models.

Factory set, no adjustment required.

S3 Dip Switch Setting

Model

Defrost Initiation

Temperature

No. 4

OFF All Refrigerators Except Pass Thru 13°F (-10°C)

ON Pass Thru 8°F (-13°C)

e) Display Board Operation (S3 dip switch 5)

ThedisplayboardmaybedisabledbymovingS3dipswitch5tothe"ON"position.When

the display board is disabled, the control board operates in default mode.

Default Mode: Compressor on 5-minutes, then off 5-minutes.

Factory set, no adjustment required.

S3 Dip Switch Setting

Display Board Status

No. 5

OFF Enabled

ON Disabled

f) Dual Temp Models (S3 dip switch 6)

DualTempappliancesrequireS3dipswitch6beplacedinthe"ON"positionforproper

operation. NOTICE! Do not adjust S3 dip switch 6 out of the factory default position.

This dip switch must be left in the factory default position or the appliance will not

operate correctly. Factory set, no adjustment required.

S3 Dip Switch Setting

Dual Temp Selector Switch

No. 6

OFF All Models Except Dual Temp

ON Dual Temp Models

g) Freezer Evaporator Fan Operation (except RFH1) (S3 dip switch 7)

ActivewhenS3dipswitch1andS3dipswitch8areinthe"OFF"position(freezer

application).WhenS3dipswitch7isinthe"ON"position,evaporatorfanoperates

continuously (except during defrost and doors open) and the temperature at which the

evaporator fan resumes after defrost changes from 0°F (-18°C) to 70°F (21°C). When

settothe"OFF"position,theevaporatorfancyclesonandoffwiththecompressor.After

defrost, evaporator fan resumes when evaporator temperature reaches 0°F (-18°C).

Factory set, no adjustment required.

Note:S3dipswitch7isignoredwhenS3dipswitch1orS3dipswitch8isinthe"ON"

position.

S3 Dip Switch Setting

Freezer Evaporator Fan Operation

No. 7

OFF

Evap. Fan Cycles On and Off with the Compressor

After Defrost, Evap. Fan Restarts when Defrost Thermistor Reaches 0°F (-18°C)

Continuous Evap. Fan (except during defrost and doors open)

After Defrost, Evap. Fan Restarts when Defrost Thermistor Reaches 70°F (21°C)

h) Dual Temp Freezer Component Control (S3 dip switch 8)

DualTemponly.ActivewhenS3dipswitch1isinthe"OFF"position(freezerapplication)

andS3dipswitch6isinthe"ON"position(DualTempapplication).When S3 dip switch

8isinthe"OFF"position,thecomponent(s)onCBK9pin#2circuitenergizeand

de-energize with the compressor and the evaporator fan motor cycles according to S3

dipswitch7setting.WhenS3dipswitch8isinthe"ON"position,thecomponent(s)

on CBK9 pin #2 circuit energize at the beginning of the rst cool down achieved cycle

and the evaporator fan motor runs continuously (except in defrost and door open).

NOTICE! Do not adjust S3 dip switch 8 out of the factory default position. This dip

switch must be left in the factory default position or the appliance will not operate

correctly. Factory set, no adjustment required.

Note:S3dipswitch8isignoredwhenS3dipswitch1isinthe"ON"positionorS3dip

switch6isinthe"OFF"position.

Model Components on CB K9 pin #2

RFH1-SSB-HD Freezer Condensate Pan Heater and

Drain Heater (aux. code Q-5 and later)

RFH1-SSB(-HS)(-HSE) Freezer Drain Heater, Perimeter Heater, and

Mullion Heater

RFH2-SSB(-HD) and RFH3-SSB(-HD) Condenser Fan Motor

S3 Dip Switch Setting

Dual Temp Freezer Component Control

No. 8

OFF

LED 5 (X5 relay) on

with

LED 4 (Compressor)

All CB K9 pin #2 components cycle on and off with compressor.

Evaporator fan motor defaults to S3 dip switch 7 setting.

LED 5 (X5 relay)

delayed on until rst

cool down achieved

then on continuously

AllCBK9pin#2componentsdelayedonuntilthebeginningoftherst"Cool

DownAchieved"cycleandremainonuntilpoweristurnedoffandbackon.

Continuous evaporator fan motor (except in defrost and door open).

After defrost, evaporator fan motor restarts when defrost thermistor reaches

0°F (-18°C)

F. Compressor Protector, Short Cycle Protection, and High-Pressure Switch

1. Compressor External or Internal Protector

If combined temperature/amperage value is above the limit specied by the compressor

manufacturer, the compressor external or internal protector operates independently to

turn off the compressor. The compressor external or internal protector de-energizes the

compressor until the temperature/amperage value returns to an acceptable level.

•Ifthecondenserfanmotorisoperatingandthecompressorisoff,itismostlikelythat

the compressor relay, external or internal protector are open.

2. Short-Cycle Protection

There is a 2.5-minute minimum off-time and on-time for the compressor.

Note: Time may vary with compressor protector or high-pressure switch activation.

3. High-Pressure Switch

If pressure on the high-side of the appliance exceeds Hoshizaki specications, the

high-pressure switch activates and interrupts the compressor circuit, de-energizing the

compressor until the pressure returns to an acceptable level. For further details, see

"III.ServiceDiagnosis".

G. Perimeter Frame Heater

This appliance is equipped with a perimeter frame heater. This prevents the formation

of condensate on the front frame of the appliance under high humidity conditions. If

operating the appliance under conditions where condensate will not form, these heaters

may be turned off using the switch on the control box.

H. Thermistors

The cabinet thermistor is used for cabinet temperature control and the defrost thermistor

is used for defrost cycle initiation and termination. Thermistor resistance varies

depending on temperature. The control board monitors the resistance to control system

operation.Noadjustmentisrequired.Forfurtherdetails,see"III.C.ThermistorCheck."

I. Glass Door Heater

-GD, PTR1SSB01-10, and PTR1SSB(-FGFG)(-HGHS)(-HGHG)(auxiliary code T-5and

earlier) models are equipped with door heater(s) and door heater switch. This prevents

the formation of condensate on the glass under high humidity conditions. If operating

appliance under conditions where condensation is not a concern, the door heater(s) may

be turned off.

III. Service Diagnosis

WARNING

•Thisapplianceshouldbediagnosedandrepairedonlybyqualiedservice

personnel to reduce the risk of death, electric shock, serious injury, or re.

•Riskofelectricshock.Useextremecautionandexercisesafeelectricalpractices.

•Movingparts(e.g.,fanblade)cancrushandcut.Keephandsclear.

•Makesureallfoodzonesarecleanaftertheapplianceisserviced.Forcleaning

procedures,see"V.A.CleaningInstructions."

A. Diagnostic Procedure

The diagnostic procedure is basically a sequence check that allows you to diagnose

the electrical system and components. Before proceeding, check for correct installation,

proper voltage per appliance nameplate. Check CB S3 dip switch settings to assure that

theyareinthefactorydefaultposition.Forfactorydefaultsettings,see"II.E.4.Default

DipSwitchSettings."Theservicemenumayusedtoviewhistoryinformation.To

accesstheservicemenu,pressandholdtheupanddownbuttonsand"ENTER"button

simultaneouslyfor3seconds.Scrollthroughtheservicemenulistusingthe"ENTER"

button.Forfurtherdetails,see"II.E.2.ServiceMenu."Asyougothroughthediagnostic

procedure, check to assure the components energize and de-energize correctly. If not,

those components or controls are suspect. Always choose a neutral (W wire) to establish

agoodneutralconnectionwhencheckinghighvoltages.CB"POWEROK"LEDremains

on unless power supply is interrupted.

IMPORTANT

The maximum allowable voltage variation is ±10 percent of the nameplate rating.

115VAC is used as a reference voltage when checking voltage to components.

Voltage may vary depending on power supply.

1)Raisethefrontpanelandmovethepowerswitchtothe"OFF"position.

2) Unplug the appliance from the electrical outlet.

3) Remove the control box cover.

4) Plug the appliance back into the electrical outlet.

5)Movethepowerswitchtothe"ON"position.

6) Conrm proper supply voltage (115VAC) to the power switch. There is a 5-second

delay while CB identies program revision. Revision (r ##) is shown on DB. After

5-second delay, DB shows current cabinet temperature. PH and MH energize when

PHswitch is on (red marking visible). Diagnosis: Checkthatred"POWEROK"LED

is on. If not, verify incoming voltage supply. Check control transformer input and

output voltage (115VAC input and 10VAC output voltage) and control transformer

continuity.If115VACinputand10VACoutputvoltageispresent,andthered"POWER

OK"LEDisoff,replaceCB.PHand MH Diagnosis: Conrm PH switch is on (red

marking visible). Next, check for voltage at PH switch. 115VAC should be present from

both black (BK) wires to any neutral (Wwire). If 115VAC is present on one and not

the other, PH switch is open. Next, check PH and MH amp draw, if no amp draw is

present, check the continuity of PH and MH.

Note:IfCBisinalarm,see"II.E.3.LEDLightsandAlarmSafetiesChart."Toclearall

alarms,setservicemenuitem3to"ON."See"II.E.2.ServiceMenu"fordetails.

Continueto"III.A.1.RefrigeratorandRFH1-SSB(-HD)(-HS)(-HSE)Refrigerator,"

"III.A.2a.Freezer(auxiliarycodeP-5andearlier)andRFH1-SSB(-HS)(-HSE)Freezer,"

or"III.A.2b.Freezer(auxiliarycodeP-6andlater)andRFH1-SSB-HDFreezer."

1. Refrigerator and RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator

7) Startup–no component LEDs are on. LED 3 (EvapFM on) is off: EvapFMenergizes.

Note: EvapFM continues unless door is opened. 2.5 minute Comp delay timer starts.

Diagnosis: Makesure"door"isnotdisplayedonDB.Ifso,checkthatCBdipswitch

#3isinthefactorydefaultposition.See,"II.E.4.c)DoorSwitchType(S3dipswitch3)."

Check door switch continuity. Next, check that EvapFM is running. If not, check EvapFM

blade for binding. Check for 115VAC at CBK1connector pin#3(DBU wire) to a neutral

(W wire). If 115VAC is not present, replace CB. If 115VAC is present, check EvapFM

continuity.

8a) Cool Down–Refrigerator: LEDs 4 (Comp) and 5 (ConFM) are on: EvapFM continues.

2.5 minute Comp delay timer terminates. Comp and ConFM energize. 2.5 min. Comp

minimum run timer starts.

8b) Cool Down–RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator: LEDs 4 (Comp and ConFM)

and 5(unused) are on: EvapFM continues. 2.5 minute Comp delay timer terminates.

Comp and ConFM energize. 2.5 min. Comp minimum run timer starts.

a) Comp Diagnosis: Check that Comp energizes. If Comp does not start, check for

115VAC at CB K1connector pin #10 (GYwire) to a neutral (W wire). If 115VAC is not

present, replace CB. If 115VAC is present, check for 115VAC at Comp relay black

(BKwire) and red (Rwire) to a neutral (Wwire). If 115VAC is not present on the black

(BK wire), check wiring connections. If 115VAC is present on black (BK wire) but not

on the red (R wire), Comp relay contacts are open. Conrm 115VAC on Comp relay

coil gray (GY wire) to a neutral (Wwire). If 115VAC is present, and contacts are open,

replace Comp relay. Next,if115VAC is present on the red (R wire), check continuity

of Comp overload. If overload is closed, check start capacitor, start relay, and Comp

motor winding. Ifoverload is open, let overload cool and reset. Replace if it does not

reset. When overload closes, if Comp still does not start, check start capacitor, start

relay, and Comp motor winding.

b1) ConFM Diagnosis: Refrigerator: If ConFM does not energize, check for 115VAC

at CBK9connector pin #2 (BR wire) to a neutral (W wire). If115VAC is not present,

replace CB. Next, check that the fan blade is not binding and the ConFM continuity

is good.

b2) ConFM Diagnosis: RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator: If ConFM does not

energize, check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral (W

wire). If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC

at Comp relay black (BK wire) and red (Rwire) to a neutral (W wire). If 115VAC is

not present on the black (BK wire), check wiring connections. If 115VAC is present

on black (BKwire) but not on the red (R wire), Comp relay contacts are open.

Conrm 115VAC on Comp relay coil gray (GY wire) to a neutral (W wire). If 115VAC

is present, and contacts are open, replace Comp relay. Next, check that the fan

blade is not binding and the ConFM continuity is good.

c) System Diagnosis: If Comp, ConFM, and EvapFM are energized and the cabinet

temperature is not dropping on DB, check that CTh is mounted and secured

correctly. If cabinet temperature is not dropping, check for a restriction in the

refrigeration circuit, correct TXV operation, and correct refrigerant charge.

9) Cool Down Achieved–Nocomponent LEDs are on: CTh cools to 3°F (1.7°C) below

setpoint. EvapFM continues. Comp and ConFM de-energize.

a1) Comp Diagnosis: Refrigerator: If Comp does not de-energize, check for 115VAC at

CB K1connector pin #10 (GYwire) to a neutral (Wwire). If 115VAC is present, and

cabinet temperature has been met by 3°F(1.7°C) or more, replace CB. If 115VAC is

not present, check continuity of Comp relay contacts. If closed, replace Comp relay.

a2) Compand ConFM Diagnosis: RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator: If

Comp and ConFM do not de-energize, check for 115VAC at CBK1connector pin

#10 (GYwire) to a neutral (Wwire). If 115VAC is present, and cabinet temperature

has been met by 3°F(1.7°C) or more, replace CB. If 115VAC is not present, check

continuity of Comprelay contacts. If closed, replace Comp relay.

b) ConFM Diagnosis: Refrigerator: IfConFM does not de-energize, check for 115VAC

at CB K9connector pin #2(BR wire) to a neutral (Wwire). If115VAC is present,

replace CB.

10) Refrigerator Defrost

A 1. Defrost Temperature-Initiation

1a) Refrigerator–LED 5 (ConFM) is on. LED 3 (EvapFM on) is off: DTh cools to

13°F (-10°C) (8°F (-13°C) for Pass-Thrus), CB initiates defrost. EvapFM continues.

ConFM continues or energizes.

1b) RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator–LED 5 (unused) is on. LED

3(EvapFM on) isoff: DTh cools to 13°F (-10°C). EvapFM continues. Comp and

ConFM de-energize.

A2. Defrost Time-Initiation

If the factory time-initiated setting is moved from 0defrosts per 24 hours, the

appliance enters the defrost cycle when the time of the new setting terminates.

Defrost timerterminates, CB initiates defrost. Defrost sequence same as

"10)A1.Temperature-Initiation"above.

B. Defrost Initiation Diagnosis

a) Thermistor Diagnosis: Has DTh cooled to 13°F (-10°C) (8°F (-13°C) for

Pass-Thrus) or lower? ConrmDThstatus,see"III.C.ThermistorCheck."

b) Comp Diagnosis: Conrm that Comp de-energizes. If not, check for 115VAC at K1

connector pin #10 (GY wire) to a neutral (Wwire). If 115VAC is present, replace CB.

If Comp is on and 115VAC is not present, check Comp relay for sticking contacts.

c1) ConFM Diagnosis: Refrigerator: Check for 115VAC at CB K9connector pin #2

(BR wire) to a neutral (W wire). If 115VAC is not present, replace CB. If 115VAC is

present, check that ConFM blade is not binding and ConFM continuity is good.

c2) ConFM Diagnosis: RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator: Check for 115VAC

at K1 connector pin #10 (GY wire) to a neutral (Wwire). If 115VAC is present,

replace CB. If Comp is on and 115VAC is not present, check Comp relay for sticking

contacts.

d) EvapFM Diagnosis:Check for 115VAC at CB K1 connector pin #3(DBUwire) to a

neutral (W wire). If 115VAC is present, check that EvapFM blade is not binding and

that EvapFM continuity is good.

C. Defrost Termination

1a) Refrigerator–LEDs 4 (Comp) and 5(ConFM) are on. LED 3 (EvapFM on) is off:

DTh warms to 40°F (4°C). EvapFM and ConFM continue. 2.5 minutes later Comp

energizes.

1b) RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator–LEDs 4 (Comp and ConFM) and

5(unused) are on. LED3(EvapFM on) isoff: DTh warms to 40°F (4°C). EvapFM

continues. 2.5 minutes later Comp and ConFM energize.

a) Thermistor Diagnosis: Has DTh warmed to 40°F (4°C) or higher? Conrm DTh

status,see"III.C.ThermistorCheck."

b) Comp Diagnosis: Conrm that after 2.5 min. Comp delay timer terminates, CB

LED4turns on and Comp energizes. If not, check for 115VAC at CB K1connector

pin #10 (GYwire) to a neutral (W wire). If 115VAC is not present, replace CB.

If 115VAC is present, check for 115VAC at Comp relay black (BKwire) and red

(Rwire) to a neutral (Wwire). If 115VAC is not present on the black (BK wire),

check wiring connections. If 115VAC is present on black (BK wire) but not on the

red (Rwire), Comp relay contacts are open. Conrm 115VAC on Comp relay coil

gray (GY wire) to a neutral (Wwire). If 115VAC is present, and contacts are open,

replace Comp relay. Next,if115VAC is present on the red (R wire), check continuity

of Comp overload. If overload is closed, check start capacitor, start relay, and Comp

motor winding. Ifoverload is open, let overload cool and reset. Replace if it does not

reset. When overload closes, if Comp still does not start, check start capacitor, start

relay, and Comp motor winding.

c1) ConFM Diagnosis: Refrigerator: IfConFM is not energized, check that LED 5

is on. Next, check for 115VAC at CB K9connector pin #2 (BR wire) to a neutral (W

wire). If 115VAC is not present, replace CB. If 115VAC is present, check that ConFM

blade is not binding and ConFM continuity is good.

c2) ConFM Diagnosis: RFH1-SSB(-HD)(-HS)(-HSE) Refrigerator: If ConFM does

not energize, check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral

(W wire). If 115VAC is not present, replace CB. If 115VAC is present, check for

115VAC at Comp relay black (BKwire) and red (Rwire) to a neutral (Wwire). If

115VAC is not present on the black (BK wire), check wiring connections. If 115VAC

is present on black (BKwire) but not on the red (R wire), Comp relay contacts are

open. Conrm 115VAC on Comp relay coil gray (GY wire) to a neutral (Wwire). If

115VAC is present, and contacts are open, replace Comp relay.

d) EvapFM Diagnosis: Check that EvapFM is running. If not, check for 115VAC at

CBK1connector pin#3(DBU wire) to a neutral (W wire). If 115VAC is not present,

replace CB. If 115VAC is present, check EvapFM blade for binding and EvapFM

continuity.

Legend: CB–control board; ConFM–condenser fan motor; Comp–compressor;

CTh–cabinet thermistor; DB–display board; DTh–defrost thermistor;

EvapFM–evaporator fan motor; MH–mullion heater; PH–perimeter heater;

TXV–thermostatic expansion valve

2a. Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)(-HSE) Freezer

7) Startup–LED 3 (EvapFM off) is on: 2.5 min. Comp delay timer starts. Cabinet

temperature appears on DB.

8a) Cool Down–Freezer (auxiliary code P-5 and earlier): LEDs 4 (Comp)

and5(ConFM) are on. LED 3 (EvapFM on) is off: 2.5min.Comp delay timer

terminates. Comp, ConFM, and EvapFM energize. 2.5 min.Comp minimum run timer

starts.

8b) Cool Down–RFH1-SSB(-HS)(-HSE) Freezer: LEDs 4 (Comp andConFM) and

5(DrH, PH, and MH) are on. LED 3 (EvapFM on) is off: 2.5min.Comp delay timer

terminates. Comp, ConFM, EvapFM, DrH, PH, and MH energize. 2.5 min.Comp

minimum run timer starts.

a) Comp Diagnosis: Check that Comp energizes. If Comp does not energize, check

for 115VAC at CB K1connector pin #10 (GYwire) to a neutral (W wire). If 115VAC is

not present, replace CB. If 115VAC is present, check for 115VAC at Comp relay black

(BK wire) and red (Rwire) to a neutral (W wire). If 115VAC is not present on the

black (BK wire), check wiring connections. If 115VAC is present on black (BKwire)

but not on the red (R wire), Comp relay contacts are open. Conrm 115VAC on Comp

relay coil gray (GY wire) to a neutral (W wire). If 115VAC is present, and contacts

are open, replace Comp relay. Next, if 115VAC is present on the red (Rwire), check

continuity of Comp overload. If overload is closed, check start capacitor, start relay,

and Comp motor winding. If overload is open, let overload cool and reset. Replace

overload if it does not reset. When overload closes, if Comp still does not start, check

start capacitor, start relay, and Comp motor winding.

b1) ConFM Diagnosis: Freezer (auxiliary code P-5 and earlier): If ConFM does

not energize, check for 115VAC at CB K9 connector pin #2 (BR wire) to a neutral

(Wwire). If115VAC is not present, replace CB. Next, check that the fan blade is not

binding and that ConFM continuity is good.

b2) ConFM Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If ConFM does not energize,

check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral (W wire).

If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at

Comp relay black (BK wire) and red (Rwire) to a neutral (W wire). If 115VAC is not

present on the black (BK wire), check wiring connections. If 115VAC is present on

black (BKwire) but not on the red (R wire), Comp relay contacts are open. Conrm

115VAC on Comp relay coil gray (GY wire) to a neutral (W wire). If 115VAC is

present, and contacts are open, replace Comp relay. Next, check that the fan blade

is not binding and that ConFM continuity is good.

c) EvapFM Diagnosis: IfEvapFMdoesnotenergize,makesure"door"isnot

displayed on DB. If so, check that CBdip switch #3 is in the factory default position.

See,"II.E.4.c)DoorSwitchType(S3dipswitch3)."Checkdoorswitchcontinuity.

Next, check for 115VAC at CBK1connector pin#3(DBU wire) to a neutral (W wire).

If 115VAC is not present, replace CB. If 115VAC is present, check EvapFM blade for

binding and EvapFM continuity.

d) DrH, PH, and MH Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If heaters do not

energize, check for 115VAC at CB K9connector pin #2 (BR wire) to a neutral (W

wire). If115VAC is not present, replace CB. If 115VAC is present, check PH/MH

switch. Next, check continuity of heaters.

e) System Diagnosis: If Comp, ConFM, and EvapFM are energized and the cabinet

temperature is not dropping on DB, check that CTh is mounted and secured

correctly. If cabinet temperature is not dropping, check for a restriction in the

refrigeration circuit, correct TXV operation, and correct refrigerant charge.

9) Cool Down Achieved–LED 3 (EvapFM off) is on: CThcools to 3°F (1.7°C) below

setpoint. Comp, ConFM, EvapFM de-energize on all freezers. DrH, PH, and MH

de-energize on RFH1-SSB(-HS)(-HSE).

a) Comp Diagnosis: If Comp does not de-energize, check for 115VAC at CB

K1connector pin #10 (GYwire) to a neutral (Wwire). If 115VAC is present, and

cabinet temperature has been met by 3°F(1.7°C) or more, replace CB. If 115VAC is

not present, check continuity of Comp relay contacts. If closed, replace Comp relay.

b1) ConFM Diagnosis: Freezer (auxiliary code P-5 and earlier): If ConFM does not

de-energize, check for 115VAC at CB K9connector pin #2(BRwire) to a neutral

(Wwire). If115VAC is present, replace CB.

b2) ConFM Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If ConFM does not

de-energize, check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral

(Wwire). If 115VAC is present, and cabinet temperature has been met by 3°F(1.7°C)

or more, replace CB. If 115VAC is not present, check continuity of Comp relay

contacts. If closed, replace Comp relay.

c) EvapFM Diagnosis: If EvapFM does not de-energize, check for 115VAC at

CBK1connector pin#3(DBU wire) to a neutral (W wire). If 115VAC is present,

replace CB.

d) DrH, PH, and MH Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If heaters do not

de-energize, check for 115VAC at CB K9connector pin #2 (BR wire) to a neutral

(Wwire). If115VAC is present, replace CB.

10) Defrost–Freezer (auxiliary code P-5 and earlier) and RFH1-SSB(-HS)(-HSE) Freezer

A. Defrost Initiation

1a) Freezer (auxiliary code P-5 and earlier)–LEDs 1 (DH) and 3(EvapFM off) are

on: DT terminates or manual defrost initiated. 20-minute minimum defrost timer

starts. 1-hour maximum defrost timer starts. DH energizes. "dEF"displayedonDB.

Ifenergized, Comp, ConFM, EvapFM de-energize.

1b) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 1 (DH) and 3(EvapFM off) are on:

DTterminates or manual defrost initiated. 20-minute minimum defrost timer

starts. 1-hour maximum defrost timer starts. DH energizes. "dEF"displayedon

DB. Ifenergized, Comp, ConFM, and EvapFM de-energize. DrH, PH, and MH

de-energize.

The time-initiated defrost is factory set to 6 times per day (every 4 hours. For

furtherdetails,see"II.E.1.b)DefrostFrequency."Beforechangingthissetting,

contact Hoshizaki Technical Support at 1-800-233-1940 for recommendations.

a) Checkout: Has DT terminated? Is"dEF"displayedonDB?CheckthatDH

energizes and Comp, ConFM, and EvapFM de-energize.

b) DH Diagnosis: Check for 115VAC at CB K1 connector pin #6 (O wire) to a

neutral (W wire). If 115VAC is not present, conrm that the appliance is not in the

5-minute defrost recovery period. Wait 5 minutes, then check CB K1 connector pin

#6(O wire) to a neutral (W wire) again. If 115VAC is not present, and Comp is not

energized, replace CB. If 115VAC is present, conrm DH amperage and continuity.

c) Comp Diagnosis: If Comp does not de-energize, check for 115VAC at CB

K1connector pin #10 (GYwire) to a neutral (W wire). If 115VAC is present, replace

CB. If 115VAC is not present, check continuity of Comp relay contacts. If closed,

replace Comp relay.

d1) ConFM Diagnosis: Freezer (auxiliary code P-5 and earlier): If ConFM does not

de-energize, check for 115VAC at CB K9connector pin #2(BRwire) to a neutral

(Wwire). If115VAC is present, replace CB.

d2) ConFM Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If ConFM does not

de-energize, check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral

(Wwire). If 115VAC is present, replace CB. If 115VAC is not present, check

continuity of Comp relay contacts. If closed, replace Comp relay.

e) EvapFM Diagnosis: If EvapFM does not de-energize, check for 115VAC at

CBK1connector pin#3(DBU wire) to a neutral (W wire). If 115VAC is present,

replace CB.

f) DrH, PH, and MH Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If heaters do not

de-energize, check for 115VAC at CB K9connector pin #2(BRwire) to a neutral

(Wwire). If115VAC is present, replace CB.

B. Defrost Termination: Defrost Recovery Step 1

1a) Freezer (auxiliary code P-5 and earlier)–LEDs 3 (EvapFM off), 4 (Comp), and

5 (ConFM) are on: DTh warms to 100°F (38°C). DH de-energizes. 5 minutes later,

Comp and ConFM energize.

1b) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 3 (EvapFM off), 4 (Comp and ConFM),

and 5 (DrH, PH, and MH) are on: DTh warms to 100°F (38°C). DH de-energizes.

5minutes later, Comp, ConFM, DrH, PH, and MH energize.

a) Checkout: Has DTh warmed to 100°F (38°C) or higher? Check that DH

de-energizes.

b) DH Diagnosis: Check for 115VAC at CB K1 connector pin #6 (O wire) to a neutral

(W wire). If 115VAC is not present, conrm that the appliance is not in the 5-minute

defrost recovery period. Wait 5 minutes, then check CB K1 connector pin #6

(O wire) to a neutral (W wire) again. If 115VAC is not present, and Comp is not

energized, replace CB. If 115VAC is present, conrm DH amperage. If amperage

is not present, check defrost thermostat and DH continuity. If amperage is present,

conrm that evaporator warms to 100°F (38°C) at DTh location. Next, check

DThstatus.See"III.C.ThermistorCheck."WhenDThreaches100°F (38°C), DH

de-energizes. If DH remains energized past 100°F (38°C), replace CB.

c) Comp Diagnosis: After 5 min. conrm that Comp energizes. If Comp does not

energize, check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral (W

wire). If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC

at Comp relay black (BK wire) and red (Rwire) to a neutral (W wire). If 115VAC is

not present on the black (BK wire), check wiring connections. If 115VAC is present

on black (BKwire) but not on the red (R wire), Comp relay contacts are open.

Conrm 115VAC on Comp relay coil gray (GY wire) to a neutral (W wire). If 115VAC

is present, and contacts are open, replace Comp relay. Next, if 115VAC is present

on the red (Rwire), check continuity of Comp overload. If overload is closed, check

start capacitor, start relay, and Comp motor winding. If overload is open, let overload

cool and reset. Replace overload if it does not reset. When overload closes, if Comp

still does not start, check start capacitor, start relay, and Comp motor winding.

d1) ConFM Diagnosis: Freezer (auxiliary code P-5 and earlier): If ConFM does

not energize, check for 115VAC at CB K9 connector pin #2 (BR wire) to a neutral

(Wwire). If115VAC is not present, replace CB. Next, check that the fan blade is not

binding and that ConFM continuity is good.

d2) ConFM Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If ConFM does not energize,

check for 115VAC at CB K1connector pin #10 (GYwire) to a neutral (W wire).

If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at

Comp relay black (BK wire) and red (Rwire) to a neutral (W wire). If 115VAC is not

present on the black (BK wire), check wiring connections. If 115VAC is present on

black (BKwire) but not on the red (R wire), Comp relay contacts are open. Conrm

115VAC on Comp relay coil gray (GY wire) to a neutral (W wire). If 115VAC is

present, and contacts are open, replace Comp relay. Next, check that the fan blade

is not binding and that ConFM continuity is good.

e) DrH, PH, and MH Diagnosis: RFH1-SSB(-HS)(-HSE) Freezer: If heaters do not

energize, check for 115VAC at CB K9connector pin #2 (BR wire) to a neutral (W

wire). If115VAC is not present, replace CB. If 115VAC is present, check PH/MH

switch. Next, check continuity of heaters

C. Defrost Termination: Defrost Recovery Step 2

1a) Freezer (auxiliary code P-5 and earlier)–LEDs 4 (Comp) and 5 (ConFM) are on.

LED 3 (EvapFM on) off: DTh cools to 70°F(21°C) or lower, EvapFM energizes.

1b) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM) and 5 (DrH, PH,

and MH) are on. LED 3 (EvapFM on) off: DTh cools to 70°F(21°C) or lower,

EvapFM energizes.

a) EvapFM Diagnosis: Conrm evaporator temperature is at or below 70°F (21°C).

CheckDThstatus.See"III.C.ThermistorCheck."IfEvapFMdoesnotenergize,

makesure"door"isnotdisplayedonDB.Ifso,checkthatCBdipswitch#3is

inthefactorydefaultposition.See"II.E.4.c)DoorSwitchType(S3dipswitch

3)."Checkdoorswitchcontinuity.Next,checkfor115VACatCBK1connector

pin#3(DBUwire) to a neutral (W wire). If 115VAC is not present, replace CB.

If115VAC is present, check EvapFM blade for binding and EvapFM continuity.

D. Defrost Termination: Defrost Completion

1a) Freezer (auxiliary code P-5 and earlier)–LEDs 4 (Comp) and 5 (ConFM) are

on. LED 3 (EvapFM on) off: When CTh reads 15°F (8.3°C) above setpoint or less,

cabinet temperature is displayed on DB. Defrost is complete.

1b) RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM) and 5 (DrH, PH,

and MH) are on. LED 3 (EvapFM on) off: When CTh reads 15°F (8.3°C) above

setpoint or less, cabinet temperature is displayed on DB. Defrost is complete.

Legend: CB–control board; ConFM–condenser fan motor; Comp–compressor;

CTh–cabinet thermistor; DB–display board; DH–defrost heater; DrH–drain heater;

DT–defrost thermostat; DTh–defrost thermistor; EvapFM–evaporator fan motor;

MH–mullion heater; PH–perimeter heater; TXV–thermostatic expansion valve

2b. Freezer (auxiliary code P-6 and later) and RFH1-SSB-HD Freezer

7) Startup–No component LEDs are on. LED3 (EvapFM on) is off: EvapFM energizes.

2.5 min. Comp delay timer starts. Cabinet temperature appears on DB.

a) EvapFM Diagnosis: IfEvapFMdoesnotenergize,makesure"door"isnot

displayed on DB. If so, check that CBdip switch #3 is in the factory default position.

See,"II.E.4.c)DoorSwitchType(S3dipswitch3)."Checkdoorswitchcontinuity.

Next, check for 115VAC at CBK1connector pin#3(DBU wire) to a neutral (W wire).

If 115VAC is not present, replace CB. If 115VAC is present, check EvapFM blade for

binding and EvapFM continuity.

8a) Cool Down–Freezer: LEDs 4 (Comp) and 5 (ConFM) are on (except RFH1-SSB-HD).

LED3(EvapFM on) is off: 2.5min. Comp delay timer terminates. EvapFM continues.

Comp and ConFM, energize. 2.5 min. Comp minimum run timer starts.

8b) Cool Down–RFH1-SSB-HD Freezer:LED 4 (Comp and ConFM) is on. LED3

(EvapFM on) is off. LED 5 (CPH and DrH) is on after rst cool down cycle: 2.5 min.

Comp delay timer terminates. EvapFM continues. CPH and DrH continue (after rst cool

down cycle). Comp and ConFM, energize. 2.5 min. Comp minimum run timer starts.