Troubleshooting: Heating Sequence Of Operation (Continued) - Haier GE APPLIANCES NF96US Service Manual

Troubleshooting: Heating Sequence of Operation (Continued)

NORMAL HEATING MODE
15-SECOND COMBUSTION AIR INDUCER PREPURGE
INITIATED BY CLOSED PRESSURE SWITCH.
IGNITOR WARM-UP -- 20 SECONDS.
4-SECOND TRIAL FOR IGNITION. GAS
VALVE OPENS. IGNITOR ENERGIZED
FOR FIRST 3 SECONDS OF THE TRIAL.
FLAME STABILIZATION PERIOD.
FLAME RECTIFICATION CURRENT
CHECK. CAN FLAME BE PROVEN
WITHIN 4 SECONDS AFTER GAS
VALVE OPENS? (0.5 microamps)
FLAME PRESENT?
FLAME SIGNAL 1.5 MICROAMPS OR GREATER?
INDOOR BLOWER ON AFTER
30-SECOND DELAY
PRIMARY LIMIT SWITCH CLOSED?
ROLLOUT SWITCH CLOSED?
COMBUSTION AIR PRESSURE
SWITCH CLOSED?
THERMOSTAT DEMAND SATISFIED.
LED SLOW FLASH.
COMB. AIR INDUCER CONTINUES 5-SECOND POST
PURGE AFTER T'STAT DEMAND IS SATISFIED.
INDOOR AIR BLOWER COMPLETES SELECTED
"OFF" DELAY BEFORE SHUTTING OFF.
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YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
ABNORMAL HEATING MODE
NO
IS VOLTAGE ABOVE 70 VOLTS?
YES
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF. HAS CONTROL FAILED TO
SENSE FLAME FOR FIVE CONSECUTIVE TRIES
NO
DURING A SINGLE HEAT DEMAND?
LED SIGNAL WATCHGUARD FAILURE CODE
WATCHGUARD MODE. GAS VALVE OFF.
COMBUSTION AIR INDUCER OFF. INDOOR
BLOWER OFF WITH DELAY IS 60-MINUTE
RESET PERIOD COMPLETE?
NO
HAS CONTROL RESET IGNITION
SEQUENCE FOUR TIMES?
LED FLASHES CODE 4 - LOW
NO
FLAME SIGNAL. (Does not affect
operation of control)
LED FLASHES CODE 7 - PRIMARY LIMIT
OPEN. GAS VALVE DE-ENERGIZED.
COMBUSTION AIR INDUCER DE-
NO
ENERGIZED. INDOOR BLOWER ON UNTIL
SWITCH CLOSES. LIMIT SWITCH CLOSED?
YES
HAS PRIMARY LIMIT RESET
TIME EXCEEDED 3 MINUTES?
NO LED FLASHES CODE 8 - 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 THERMOSTAT IS CYCLED OFF/ON
NO
HAS PRESSURE SWITCH OPENED
5 TIMES IN SAME HEAT DEMAND
NO
GAS VALVE DE-ENERGIZED.
COMBUSTION AIR INDUCER ON.
INDOOR BLOWER OFF WITH DELAY HAS
CAI SWITCH CLOSED IN 2.5 MINUTES?
NO
5-MINUTE PRESSURE SWITCH
WATCHGUARD MODE.
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LED FLASHES CODE
13 - LOW LINE VOLTAGE.
ONCE VOLTAGE IS ABOVE
75 VOLTS, HEATING
SEQUENCE RESTARTS.
NO
YES
YES
LED FLASHES
CODE 7 - PRIMARY
LIMIT OPEN. GAS
VALVE, COMB.
AIR INDUCER AND
INDOOR BLOWER
OFF. LEDs SIGNAL
LIMIT SWITCH OPEN
UNTIL MAIN POWER
IS INTERRUPTED OR
T'STAT IS CYCLED
OFF/ON FOR 1 SEC
MIN. 60-MINUTE
WATCHGUARD
PERIOD STARTS AT
YES
TIME LIMIT CLOSES.
IS 60-MIN. PERIOD
COMPLETE?
NO
FOR 1 SEC. MIN.
LED FLASHES
CODE 10 1 HR
YES
PRESSURE
SWITCH
WATCHGUARD
MODE
YES
NO
YES