Troubleshooting - Haier GE NF80XV Series Service Manual

Troubleshooting

CALL FOR FIRST-STAGE HEAT
1
CALL FOR
1ST STAGE HEAT
(LOW FIRE)
HIGH
LIMIT SWITCH
CLOSED?
YES
ROLLOUT
CIRCUITS
CLOSED?
YES
LOW
PRESSURE
SWITCH
OPEN?
YES
INDUCER ON
LOW SPEED
LOW
PRESSURE SWITCH
CLOSED WITHIN 120
SECONDS?
YES
PRE−PURGE
(15 SECONDS)
H.S.I. ON
(20 SECONDS)
1ST STAGE GAS
VALVE ENERGIZED
IGNITION TRIAL
BEGINS (H.S.I. ON)
FLAME
SENSED WITHIN
4 SECONDS?
YES
H.S.I. OFF
INDOOR
BLOWER ON 30 SEC.
(LOW HEAT SPEED)
2
CALL FOR HEAT SATISFIED
31-5000734 Rev. 0
INDOOR BLOWER OFF AFTER
HEAT FAN OFF DELAY
(LOW HEAT SPEED)
ERROR
INDOOR
NO
CODE
BLOWER
FLASHES
ON(LOW HEAT
SPEED)
INDUCER ON
(HIGH SPEED)
DE−ENERGIZE
NO
GAS VALVE
INDOOR BLOWER
ON (LOW HEAT
ERROR CODE
FLASHES (AFTER
NO
5 SECONDS)
LOW PRESSURE
SWITCH OPENS
HIGH
PRESSURE
SWITCH
OPEN
NO
BEFORE
INDUCER WAS
TURNED ON?
3
HEAT FAN ON DELAY
TIMER STARTED
GAS VALVE
DE−ENERGIZED
NO
H.S.I. OFF
1
WATCHGUARD LOCKOUT AUTOMATICALLY RESETS AFTER ONE HOUR
2 HARD LOCKOUT REQUIRES THERMOSTAT RESET OR CYCLING OF POWER TO RESET THE LOCKOUT.
3 IN CASE HIGH SPEED INDUCER IS RUNNING AT THE TIME THE GAS VALVE GETS ENERGIZED,
2ND STAGE GAS VALVE IS ENERGIZED INSTEAD OF 1ST STAGE. 20 SECONDS AFTER FLAME
IS SENSED, INDUCER SWITCHES TO LOW SPEED, AND GAS VALVE SWITCHES TO 1ST STAGE.
Figure 24. Heating Sequence of Operation
NO
YES
LIMIT
BLOWER OFF
SWITCH
AFTER HEAT FAN
NO
CLOSED WITHIN 3
OFF DELAY (LOW
MINUTES?
ROLLOUT
ERROR
CIRCUIT
CODE
FLASHES
CLOSES
SPEED)
NO
INDOOR BLOWER
OFF AFTER HEAT
OFF DELAY
HARD LOCKOUT −
ERROR CODE
FLASHES
LOW & HIGH
INDUCER TO
PRESSURE SWITCH
HIGH SPEED−
YES
CLOSED WITHIN 30
ERROR CODE
SECONDS?
FLASHES
NO
INTERPURGE
(15 SECONDS)
NO
5TH
POSTPURGE
UNSUCCESSFUL YES
(5 SECONDS)
TRIAL?
Page 43
INDOOR
WATCHGUARD −
ERROR CODE
1
FLASHES
HEAT SPEED)
CALL
FOR HEAT
ENDS?
YES
INDUCER OFF
AFTER POST
PURGE
2
NO
INDOOR INDOOR
BLOWER BLOWER
YES
YES
INDUCER OFF−
INDOOR
WAIT
BLOWER
5 MINUTES
OFF AFTER
ERROR CODE
HEAT FAN
FLASHES
OFF DELAY
WATCHGUARD −
INDUCER
ERROR CODE
OFF
1
FLASHES
NO
YES
ON? ON?
NO
YES
1