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Service Information
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Check system operating pressure
Is the system operating pressure
Yes
Gas manifold pressure Correct
Check the following
1- Does the unit have the correct
air orifice size? See table 14.
2- Is the air orifice fully seated tight
against the elbow ?
3-
anyway?
4- Is the air inlet screen clear of any
obstruction ?
Correct any problems found.
Is ignition or noise issue
resolved ?
Check Air Orifice
Troubleshooting is complete
Check Gas Manifold Pressure
within range correct ?
Check the following
1- Vent /air intake pipe restriction.
2- Plugged air inlet screen
3- Signal hoses to gas valve
for kinks, loose fit or plugging.
Correct any problems found
Is system operating
pressure correct ?
Is ignition or noise issue
resolved?
No
No
Yes
Is the incoming voltage
between 108V and 132V?
Is gas supply pressure
between 4.5” to 10” wc
Call a licensed electrician
or the electric comp.
Call a licensed plumber
or
the gas comp.
No
No
Yes
Is the air orifice damaged in
No
No
Replace gas valve
Yes
Troubleshooting is complete
No
Replace air orifice.
See table 14.
Is Ignition or noise issue
resolved?
060 models ONLY:
Install 30 in. air intake.
See figure 25.
No
Yes
Troubleshooting is complete
Is the Combustion Air Intake
assembled and installed correctly?
See Figure 25.
Yes
No
Assemble and Install
Combustion Air Intake
correctly.
Is Ignition or noise issue
resolved?
Troubleshooting is complete
No
Yes
Yes
Replace air oriifice. See table 14
Is ignition or noise issue resolved
Yes
No
Troubleshooting is complete
Yes
Replace gas valve
Troubleshooting
continues see next page
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31-5001007 Rev. 0
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Is ignition or noise issue resolved
Is ignition or noise issue resolved ?
No
060 models only: Install 30 in.
air intake pipe. See figure 25.
.
No
Install Low Profile Combustion
Air Intake Kit Catalog No. 25B23
Contact tech support
Troubleshooting is complete
Troubleshooting is complete
Yes
Yes
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GAS VALVE
GV1
Supersedes
Litho U.S.A.
C
ROOM THERMOSTAT
5
5
USE COPPER CONDUCTORS ONLY.
J156
P156
J156
P156
J,P84
JACK/PLUG-COMB AIR INDUCER
BLUE
BLUE
BROWN
BROWN
ORANGE
YELLOW
2011
R
R
L13
POWER
CHOKE
J84
P84
J,P48
J,P49
JACK/PLUG-INDOOR BLOWER-POWER
JACK/PLUG-INDOOR BLOWER-SPD TAP
BLACK
YELLOW
RED
BROWN,BLUE
FAN
BLUE
SPEED TAPS
C
12
9
5
11 1
7
GREEN/YELLOW
8
PARK
PARK
FAN
HUM24
INTEGRATED CONTROL
GND
SEE BLOWER SPEED CHART
12
3
45
C
L
G
N
B3
INDOOR
BLOWER
MOTOR
WHT/BLK
BLACK
GN/YLW
WHT
P58
J58
24V
COM
6
CIRC
BLACK
A92
DO NOT USE RED (LOW SPEED) MOTOR LEAD FOR
HEATING SPEED RESULTING TEMPERATURE RISE
WILL BE OUTSIDE OF RISE RANGE.
L13 POWER CHOKE USED ON
3
4
AND 1 HP ONLY
120 V NEUTRALS
WHITE
A92 INTEGRATED
CONTROL
L13 POWER
CHOKE
4
2
3
3
4
'R' REQUIRED ON SOME OUTDOOR UNITS
1
HEAT
AUTO
P49
P48
WHITE
BLACK
FS
WHITE/
PINK
TR
TH
BLUE
J49
P49
J48
P48
PURPLE
HL0
HL1
PS
(S)
JACK/PLUG CHART
K6
K7
K5
BLACK
WHITE
GN/YLW
5
5
YELLOW
BLUEBLUE
BLUE
BLUE
RED
YLW
BRN
BLK
GN/YLW
K2
K3
K4
ALL
CB8
CB8
CIRCUIT
BREAKER
10
S18
PURPLE
B6
2
3
4
RED
PUR
BLK
WHT
BLK
1
YEL
INDUCER
WARNING-
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY OR
DEATH.UNIT MUST BE GROUNDED IN ACCORDANCE
WITH NATIONAL AND LOCAL CODES.
EQUIPMENT
GROUND
FLAME
SENSOR
PARK TERMINALS ARE UNPOWERED TERMINALS. ALL
UNUSED MOTOR LEADS MUST BE WIRED TO A PARK
TERMINAL.
NOTE-
IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT
MUST BE REPLACED WITH WIRE OF LIKE SIZE,
RATING,INSULATION THICKNESS AND TERMINATION.
COMBUSTION
AIR INDUCER
S18
COMBUSTION AIR
PROVING SWITCH
FLAME ROLLOUT
SWITCH
FLAME
SENSOR
S10
PRIMARY GAS
LIMIT
S51
DOOR
INTERLOCK
S1
ROOM THERMOSTAT
T1 TRANSFORMER
OUTDOOR
UNIT
B3
INDOOR
BLOWER MOTOR
INDOOR
EVAPORATOR COIL
LGWP SENSORS
R
G
W
Y
C
2
3
4
5
6
7
8
9
10
11
12
1
DIAGNOSTIC
PUSH BUTTON
P1
O
1
2
4
3
J5
J4
LGWP SENSORS
A92 CONTROL
INTEGRATED
P2
NEUTRALS
12
12
LGWP
TEST
LGWP
SW1
SW3
SW2
P8
ALARM
ZONE
120V ACC
(IF USED)
P3
ACC
LINE
HUM
HUMIDIFIER
SEE HUM VIEWS
HUMIDIFIER
120VAC
HUM
AT IFC
TO N
TO L1
Service Information
3DJH
31-5001007 Rev. 0
Service Information
7528%/(6+227,1*+HDWLQJ6HTXHQFHRI2SHUDWLRQ
NORMAL HEATING MODE
ABNORMAL HEATING MODE
CONTROL SELF-CHECK OKAY?
BURNER OFF?
(Flame sensed without gas valve energized)
NORMAL OPERATION:
SEVEN SEGEMENT LED FLASHES “.” PERIODICALLY
NO
YES
YES
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER DELAY OFF.
(Reset control by turning main power off.)
SEVEN SEGEMENT LED FLASHES E111 -
POLARITY REVERSED.
POWER ON
IS POLARITY CORRECT?
ROLLOUT SWITCH CLOSED?
THERMOSTAT CALLS FOR HEAT:
SEVEN SEGEMENT LED FLASHES “H”
FOR ACTIVE HEAT DEMAND
IS COMBUSTION AIR
PRESSURE SWITCH OPEN?
SEVEN SEGEMENT LED FLASHES E200 -
GAS VALVE OFF. ROLLOUT SWITCH OPEN. COMBUSTION AIR
INDUCER ON. INDOOR BLOWER ON. SEQUENCE HOLDS
UNTIL ROLLOUT SWITCH CLOSES AND POWER IS RESET
OR T’STAT IS INTERRUPTED FOR MINIMUM OF 1 SECOND.
SEVEN SEGEMENT LED FLASHES E241 -
FLAME SENSED WITHOUT GAS VALVE ENERGIZED.
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER ON HEATING SPEED.
SEVEN SEGEMENT LED FLASHES E224 -
PRESSURE SWITCH CLOSED. GAS VALVE
OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF WITH DELAY.
(Sequence holds until pressure switch
opens or thermostat resets control.)
NO
NO
YES
YES
IS VOLTAGE
ABOVE 70 VOLTS?
SEVEN SEGEMENT LED FLASHES E110 -
LOW LINE VOLTAGE. CONTROL WILL NOT RESPOND TO A CALL
FOR HEATING UNTIL VOLTAGE RISES ABOVE 75 VOLTS.
NO
NO
NO
IS COMBUSTION AIR INDUCER
ENERGIZED?
HAS COMBUSTION AIR PRESSURE
SWITCH CLOSED IN 2.5 MINUTES?
YES
YES
SEVEN SEGEMENT LED FLASHES 223 -
NO
PRIMARY LIMIT SWITCH. CLOSED?
YES
YES
CONTINUED NEXT PAGE
NO
YES
NO
YES
IS THERE A PROPER GROUND?
YES
NO
SEVEN SEGEMENT FLASHES E117 -
IMPROPER GROUND.
YES
YES
SEVEN SEGEMENT LED FLASHES E250 -
PRIMARY LIMIT OPEN. COMBUSTION AIR
INDUCER OFF. INDOOR BLOWER ON.
PRESSURE SWITCH FAILED TO CLOSE OR OPENED
DURING HEAT DEMAND. PRESSURE SWITCH IS IN
WATCHGUARD MODE. GAS VALVE OFF. COMBUSTION AIR
INDUCER OFF. INDOOR BLOWER OFF WITH DELAY.
IS 5-MINUTE RESET COMPLETE ?
3DJH
31-5001007 Rev. 0
Service Information
7528%/(6+227,1*+HDWLQJ6HTXHQFHRI2SHUDWLRQFRQW
ABNORMAL HEATING MODENORMAL HEATING MODE
FLAME RECTIFICATION CURRENT
CHECK. CAN FLAME BE PROVEN WITHIN
4 SECONDS AFTER GAS VALVE OPENS?
(0.5 microamps)
TION CURRENT
FLAME PRESENT?
INDOOR BLOWER ON
AFTER 30-SECOND DELAY
PRIMARY LIMIT SWITCH CLOSED?
COMBUSTION AIR PRESSURE
SWITCH CLOSED?
HAS PRESSURE SWITCH OPENED 5 TIMES
IN THE SAME HEAT DEMAND?
15-SECOND COMBUSTION AIR INDUCER PREPURGE
INITIATED BY CLOSED PRESSURE SWITCH
YES
IGNITOR WARM-UP -- 20 SECONDS.
YES
YES
FLAME STABILIZATION PERIOD.
GAS VALVE OFF. CONBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF. HAS CONTROL FAILED
TO SENSE FLAME FOR FIVE CONSECUTIVE
TRIES DURING A SINGLE HEAT DEMAND?
SEVEN SEGEMENT LED FLASHES E270 -
WATCHGUARD FAILURE CODE. GAS VALVE OFF.
COMBUSTION AIR INDUCER OFF. INDOOR BLOWER
OFF WITH DELAY.
IS 60-MINUTE RESET PERIOD COMPLETE?
YES
4 SECONDS
YES
HAS CONTROL RESET IGNITION
SEQUENCE FOUR TIMES?
FLAME SIGNAL 1.5 MICROAMPS OR GREATER?
YES
YES
YES
ROLLOUT SWITCH CLOSED?
SEVEN SEGEMENT LED FLASHES E200
ROLLOUT SWITCH OPEN. GAS VALVE POWER OFF.
COMBUSTION AIR INDUCER POWER ON. INDOOR BLOWER
ON SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESET
AND MAIN POWER IS INTERRUPTED OR THEMOSTAT IS
CYCLED OFF/ON FOR 1 SECOND MINIMUM.
YES
THERMOSTAT DEMAND SATISFIED.
COMB. AIR INDUCER CONTINUES 5-SECOND
POST PURGE AFTER T’STAT DEMAND IS SATISFIED.
INDOOR AIR BLOWER COMPLETES SELECTED “OFF”
DELAY BEFORE SHUTTING OFF.
YES
NO
5-MINUTE PRESSURE SWITCH
WATCHGUARD MODE.
YES
IS VOLTAGE ABOVE 70 VOLTS?
SEVEN SEGEMENT LED E110
LOW LINE VOLTAGE.
ONCE VOLTAGE IS ABOVE 75
VOLTS, HEATING SEQUENCE
RESTARTS.
NO
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
NO
NO
NO
YES
YES
HAS PRIMARY LIMIT RESET
TIME EXCEEDED 3 MINUTES?
NO
YES
4-SECOND TRIAL FOR IGNITION.
GAS VALVE OPENS. IGNITOR ENERGIZED FOR
FIRST 3 SECONDS OF THE TRIAL.
GAS VALVE DE-ENERGIZED. COMBUSTION AIR
INDUCER ON. INDOOR BLOWER OFF WITH
DELAY. HAS CAB PRESSURE SWITCH CLOSED
WITHIN 2.5 MINUTES?
NO
YES
SEVEN SEGEMENT LED FLASHES E240
LOW FLAME SIGNAL
(does not affect operation of control)
SEVEN SEGEMENT LED FLASHES E250
PRIMARY LIMIT OPEN. GAS VALVE ENERGIZED.
COMBUSTION AIR INDUCER DE-ENERGIZED.
INDOOR BLOWER ON UNTIL SWITCH CLOSES.
LIMIT SWITCH CLOSED?
SEVEN SEGEMENT
LED FLASHES E271
1 HR PRESSURE
SWITCH
WATCHGUARD
MODE
SEVEN SEGEMENT
LED FLASHES E274
PRIMARY LIMIT OPEN.
GAS VALVE, COMB.
AIR INCUCER AND
INDOOR BLOWER
OFF. LEDs SIGNAL
LIMIT SWITCH OPEN
UNTIL MAIN POWER
IS INTERRUPTED OR
T’STAT IS CYCLED
OFF/ON FOR 1 SEC.
MINIMUM. 60-MINUTE
WATCHGUARD
PERIOD STARTS AT
TIME LIMIT CLOSES.
IS 60-MINUTE PERIOD
COMPLETE?
3DJH
31-5001007 Rev. 0
Service Information
7528%/(6+227,1*&RROLQJ6HTXHQFHRI2SHUDWLRQ
&RQWLQXRXV)DQ6HTXHQFH2I2SHUDWLRQPDQXDO
EDOMGNILOOCLAMRONBAEDOMGNILOOCLAMRON
IGNITION CONTROL MAIN POWER ON.
CONTROL SELF DIAGNOSTIC CHECK.
IS CONTROL OPERATING NORMALLY?
YES
SEVEN SEGEMENT LED FLASHES E111 POLARITY REVERSED
CONTROL WILL CONTINUE TO CALL FOR COOLING IN
THIS CONDITION.
POWER ON
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF WITH NORMAL DELAY
SIGNAL CIRCUIT BOARD FAILURE AT LED.
INTERRUPT MAIN POWER TO RESET CONTROL.
YES
IS POLARITY CORRECT?
ROLLOUT SWITCH MONITORED CONTINUOUSLY.
IS ROLLOUT SWITCH CLOSED?
THERMOSTAT CALLS FOR COOLING.
COMPRESSOR CONTACTOR AND SYSTEM FAN
ENERGIZED WITH 2‐SECOND DELAY
(COOLING SPEED). EAC TERM. ENERGIZED.
COMPRESSOR OFF.
THERMOSTAT OPENS.
SYSTEM FAN AND EAC TERM. OFF
WITH 45‐SECOND DELAY.
NO
NO
SEVEN SEGEMENT LED FLASHES E200 ROLLOUT SWITCH OPEN.
GAS VALVE OFF. COMBUSTION AIR INDUCER ON. INDOOR
BLOWER ON. SEQUENCE HOLDS UNTIL ROLLOUT SWITCH
CLOSES AND MAIN POWER IS INTERRUPTED OR THERMOSTAT
IS CYCLED OFF/ON FOR 1 SEC. MINIMUM.
IS VOLTAGE
ABOVE 70 VOLTS?
SEVEN SEGEMENT LED FLASHES E110 LOW VOLTAGE
CONTROL WILL CONTINUE TO CALL FOR COOLING
IN THIS CONDITION.
YES
YES
NO
NO
IS THERE A PROPER GROUND?
YES
NO
SEVEN SEGEMENT LED FLASHES E117 IMPROPER GROUND
CONTROL WILL CONTINUE TO CALL FOR COOLING IN
THIS CONDITION.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTRTOL (G) ENERGIZES SYSTEM FAN AT FAN
SPEED. EAC TERMINAL IS ENERGIZED.
THERMOSTAT CALLS FOR HEAT (W).
THERMOSTAT CALLS FOR COOLING.
THERMOSTAT OPENS.
SYSTEM FAN SWITCHED TO COOL SPEED.
EAC TERM. REMAILS ON.
THERMOSTAT OPENS.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAT AT FAN
SPEED. EAC TERM. ENERGIZED.
NO
YES
YES
NO
SYSTEM FAN SWITCHES TO HEAT SPEED AFTER 30
SECOND DELAY. EAC AND HUM TERMINALS REMAIN ON.
SYSTEM FAN CONTINUES FAN SPEED WITHOUT
INTERRUPTION. EAC TERMINAL REMAINS ON.
HUM TERMINAL IS ENERGIZED WITH COMBUSTION
AIR BLOWER.
HUM. TERMINAL OFF AFTER POST PURGE BY
COMBUSTION AIR BLOWER. SYSTEM FAN
SWITCHED TO FAN SPEED AFTER BLOWER OFF
DELAY. EAC CONTINUES WITHOUT INTERRUPTION.
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