Hoshizaki F2A-HG Service manual

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1. Refrigerator

5) Startup/Cool Down–MH, PH, and TXVH energize. There is a slight delay, Comp,

ConFM, and EvapFM energize. On PT2A and R_2A, MH and BH also energize. Cabinet

temperature appears on display and 2-hr. defrost timer starts. Note: If DTh is above

50°F (10°C) EvapFM is de-energized.

a) MH Diagnosis: MH energizes at startup (except PT2A). If 115VAC is present,

check amp draw of MH. If an amp reading is not present, check the continuity of

MH. If defective, replace MH. Note: MH energizes and de-energizes with Comp and

CondFM on PT2A and R_2A models.

b) BH Diagnosis: BH energizes at startup on R_1A and with Comp on R_2A.

If 115VAC is present, check amp draw of BH. If an amp reading is not present, check

the continuity of BH. If defective, replace BH. Note: BH energizes and de-energizes

with Comp and CondFM on R_2A models.

c) TXVH (if applicable) Diagnosis: Conrm amp draw of TXVH. If no amp draw

available, check for 115VAC at TXVH grey wire (GY) to neutral (W). If 115VAC is

not present, check wiring connections to TXVH. If 115VAC is present, check TXVH

continuity. If open, replace TXVH.

d) EvapFMDiagnosis: Conrm that EvapFM(s) energize. If not, conrm DTh is at

50°F (10°C) or lower, doors are closed and DS engaged, check DS continuity.

If DTh is above 50°F (10°C), wait for evaporator to cool down. If DS is engaged and

contacts are open, replace DS. If DS is engaged and contacts are closed, check for

115VAC at CM 5 (F) dark blue (DBU) wire to neutral white (W) wire. If 115VAC is not

present, replace CM. If 115VAC is present, check EvapFM blades for binding and

EvapFM continuity.

e) Solid Door Cabinet Light Diagnosis: LED(s) are activated from door switch.

Open the door (upper on HS/HG), conrm LED(s) energizes. If not, with door open,

check for 5 to 12VDC at CM S4 brown (BR) to CM S4 blue (BU). If 5 to 12VDC

is not present at CM S4 brown (BR) to CM S4 blue (BU), conrm 115VAC power

supply to CM at terminals 2 (L) black (BK) to 3 (N) white (W). If 115VAC is present,

and LED(s) are off, check DS continuity. If DS is disengaged (open) and contacts

are closed, replace DS. IfDS is disengaged (open) and contacts are open, check

for 115VAC from CM 6 (LED) (Y) to a neutral (W). If 115VAC is not present, replace

CM. If 115VAC is present at CM 6 (LED) (Y) to a neutral (W) and LED(s) are not

on, check for 24VDC at DCD black (BK) wire to DCD red (R) wire. If 24VDC is not

present, check continuity of DCD driver. If open, replace DCD driver. If 24VDC is

present and LED(s) are not on, check wiring harness and wiring connections from

DCD to LED(s). Ifconnections are good and LED(s) are not on, replace LED(s).

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Hoshizaki F2A-HG 55'' 50.37 cu. ft. Top Mounted 2 Section Glass Half Door Reach-In Freezer