Troubleshooting - Lennox ELITE Series Installation Instructions Manual

Troubleshooting: Heating Sequence of Operation
Flame sensed without gas valve energized
(
NO
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HEATING SEQUENCE OF OPERATION
NORMAL HEATING MODE
POWER ON
CONTROL SELF−CHECK OKAY?
YES
IS POLARITY CORRECT?
YES
IS THERE A PROPER GROUND?
YES
IS VOLTAGE
ABOVE 70 VOLTS?
YES
ROLLOUT SWITCH CLOSED?
YES
BURNER OFF?
YES
NORMAL OPERATION:
LED SLOW FLASH
YES
THERMOSTAT CALLS FOR HEAT:
LED SLOW FLASH
YES
PRIMARY LIMIT SWITCH. CLOSED?
YES
IS COMBUSTION AIR
PRESSURE SWITCH OPEN?
YES
IS COMBUSTION AIR INDUCER
ENERGIZED?
YES
HAS COMBUSTION AIR PRESSURE
SWITCH CLOSED IN 2.5 MINUTES?
YES
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ABNORMAL HEATING MODE
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
NO
(RESET CONTROL BY TURNING MAIN POWER OFF.)
NO
LED FLASHES CODE 1 − POLARITY REVERSED.
NO
LED FLASHES CODE 2 − IMPROPER GROUND.
NO
LED FLASHES CODE 13 − LOW LINE VOLTAGE.
CONTROL WILL NOT RESPOND TO A CALL FOR
HEATING UNTIL VOLTAGE RISES ABOVE 75 VOLTS.
LED FLASHES CODE 8 − ROLLOUT SWITCH OPEN.
NO
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES
AND POWER IS RESET OR T'STAT IS INTERRUPTED
LED FLASHES CODE 12 − FLAME SENSED
NO
WITHOUT GAS VALVE ENERGIZED.
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
)
INDOOR BLOWER ON HEATING SPEED.
LED FLASHES CODE 7 − PRIMARY LMIT
NO
LED FLASHES CODE 11 − PRESSURE
NO
LED FLASHES CODE 9 − PRESSURE SWITCH FAILED
NO 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 PERIOD COMPLETE?
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INDOOR BLOWER DELAY OFF.
LED SLOW FLASH
INDOOR BLOWER ON.
FOR MINIMUM OF 1 SECOND.
OPEN. COMBUSTION AIR INDUCER
OFF.INDOOR BLOWER ON
SWITCH CLOSED.
GAS VALVE OFF COMBUSTION AIR
INDUCER OFF. INDOOR BLOWER
OFF WITH DELAY.
(Sequence holds until pressure switch
opens or thermostat resets control.)
YES