SYSTEM OPERA
TION
51
Rev. 0
TROUBLESHOOTING CHART
Sheet 2 of 2
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.
Corrective Action
Cautions and
Notes
- Correct short at flame sensor or in flame sensor wiring.
- Turn power OFF prior to repair.
- 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.
- 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.
- 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.
- Turn power OFF prior to repair.
- See Specification Sheet for allowable rise range and proper
circulator blower speed.
- 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.
Symptoms of Abnormal
Operation
Associated
LED Code
(See Note 2)
Fault Description(s)
Possible Causes
- Induced draft and circulator blower run
continuously with no further
furnace operation.
and
- Integrated control module diagnostic
LED is flashing continuously.
Continuous
Flashing
- Flame has been sensed with no call
for heat.
- Short to ground in flame sense circuit.
- Limit circuit (primary or auxiliary) has
opened five times during a single call
for heat. See note 1.
- Pressure switch circuit has opened five
times during a single call for heat.
See note 3.
- 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.
- Circulator blower running continuously
with
no further furnace operation
and
- Integrated control module diagnostic
LED is flashing nine flashes.
9 Flashes
- Furnace is not operating
and
- Integrated control module diagnostic
LED is flashing eight flashes.
8 Flashes
- 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.
7 Flashes
- Normal furnace operation.
but
- Integrated control module diagnostic
LED is flashing seven flashes.
- Flame sense micro-amp signal is low.
- Flame sensor is coated/oxidized.
- Flame sensor incorrectly positioned in burner flame.
- Lazy burner flame due to improper gas pressure, or
combustion air.
C
White Rodgers
Control Only
7
Heatcraft
Control Only
8
9
Heatcraft
Control Only
