Amana GUCA045AX30 Service Instructions Manual page 51

Associated
Symptoms of Abnormal
LED Code
Operation
(See Note 2)
7
- Normal furnace operation.
but
- Flame sense micro-amp signal is low.
- Integrated control module diagnostic 7 Flashes
LED is flashing seven flashes.
White Rodgers
Control Only
8
- Furnace is not operating
- Pressure switch circuit has opened five
and
times during a single call for heat.
- Integrated control module diagnostic 8 Flashes
See note 3.
LED is flashing eight flashes.
Heatcraft
Control Only
- Circulator blower running continuously
9
with
- Limit circuit (primary or auxiliary) has
no further furnace operation
opened five times during a single call
and
9 Flashes
for heat. See note 1.
- Integrated control module diagnostic
Heatcraft
LED is flashing nine flashes.
Control Only
- Induced draft and circulator blower run
continuously with no further
C
furnace operation. - Flame has been sensed with no call
and for heat.
Continuous
- Integrated control module diagnostic
Flashing
LED is flashing continuously.
Notes:
1) Integrated control module will automatically attempt to reset from lock out after one hour.
2) LED flash code will cease if power to the control module is interrupted through the disconnect or door switch.
3) Integrated control module will automatically attempt to reset from lock out after 20 minutes.
TROUBLESHOOTING CHART
Fault Description(s) Possible Causes
- Flame sensor is coated/oxidized.
- Flame sensor incorrectly positioned in burner flame.
- Lazy burner flame due to improper gas pressure, or
combustion air.
- Pressure switch hose blocked, pinched, or
misconnected.
- Blocked flue and/or inlet air pipe, blocked drain
system, or weak induced draft blower.
- Incorrect pressure switch set point or
malfunctioning switch contacts.
- Loose or misconnected wiring.
- Insufficient conditioned air over the heat exchanger.
Cause may be blocked filters, restrictive
ductwork, improper circulator blower speed, or
failed circulator blower.
- Loose or misconnected wiring.
- Short to ground in flame sense circuit.
Corrective Action
- Sand flame sensor if coated/oxidized. Inspect for proper sensor alignment.
- Check inlet air piping for blockage, proper length, elbows, and termination.
- Check for proper gas pressures.
- Check and correct pressure switch hose.
- Check flue and/or inlet air piping for blockage, proper length, elbows
and termination. Check drain system.
- Verify proper pressure switch set point and contact motion.
- Check and correct wiring.
- Check filters and ductwork. For blockage . Clean filters or remove obstruction.
- Check for proper circulation blower speed and performance. Correct speed or replace
blower if necessary.
- Check and correct wiring.
- Correct short at flame sensor or in flame sensor wiring.
Sheet 2 of 2
Cautions and
Notes
- Turn power OFF prior to repair.
- Sand flame sensor with emery cloth.
- See "Flue and Combustion Air Pipe" section for piping
details.
- See rating plate for proper gas pressures.
- Turn power OFF prior to repair.
- See "Flue and Combustion Air Pipe" section for piping
details.
- Replace pressure switch with proper replacement part.
- Turn power OFF prior to repair.
- See Specification Sheet for allowable rise range and proper
circulator blower speed.
- Turn power OFF prior to repair.