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2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
TROUBLESHOOTING CHART
4
4 FLASHES
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FOUR (4) flashes.
6
6 FLASHES
7
7 FLASHES
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing
SIX (6) flashes.
• No furnace operation.
• Normal furnace
operation.
• Integrated control module
diagnostic LED is
flashing SEVEN (7)
flashes.
• Rollout limit open.
• Integrated control
module fuse is
blown.
• Flame sense
microamp 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.
• Sand flame sensor.
• Inspect for proper sensor
alignment.
• Compare current gas
pressure to rating plate
info. Adjust as needed.
• Turn power OFF
prior to repair.
• Clean flame sensor
with steel wool.
• See “Vent/Flue
Pipe” section for
piping details.
• See rating plate for
proper gas
pressure.
• See “Vent/Flue
Pipe” section for
piping details.
• Replace induced
draft blower with
proper replace-
ment part.
• Replace inte-
grated control
module fuse with
3A automotive
fuse.
• Read precautions
in “Electrostatic
Discharge”
section of manual.
• Replace rollout
limit with correct
replacement part.
• Primary limit
circuit is open.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
continuously.
C
CONTINUOUS
FLASHING
• Polarity of 115
or 24 volt
power is
reversed.
• Polarity of 115 volt AC
power to furnace or
integrated control module
is reversed.
• Red and blue wires to
transformer are reversed.
• Poor unit ground.
• Review wiring diagram to
correct polarity.
• Verify proper ground.
Correct if necessary.
• Reverse red and blue
wires connected to
transformer.
• Turn power OFF
prior to repair.
• Normal operation.
• LED is steady on
STEADY
• Check burners for proper
alignment.
• Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination. Correct
as necessary.
• Check rollout limit. Replace
if necessary.
• Check induced draft
blower for proper
performance. Replace, if
necessary.
• Tighten or correct wiring
connection.
• Repair short in 24 volt AC
control/safety circuit(s).
• Replace integrated control
module fuse (3A).
• Flame rollout.
• Misaligned burners,
blocked flue and/or air
inlet pipe, or failed
induced draft blower.
• Loose or improperly
connected wiring.
• Short in 24 volt AC
control circuits or safety
circuits.
•Faulty rollout limit.
• Induced draft blower and
circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FIVE (5) flashes.
5
5 FLASHES
• Flame sensed
with no call for
heat.
• Short to ground in flame
sense circuit.
• Correct short at flame
sensor or in flame
sensor wiring.
• Turn power OFF
prior to repair.
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed, or
failed circulator blower.
• Faulty primary limit switch.
• Loose or improperly
connected wiring.
• Check primary limit.
Replace if necessary.
• Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
• Check circulator blower
speed and performance.
Correct speed or replace
blower if necessary.
• Tighten or correct wiring
connection.
• Turn power OFF
prior to repair.
• Replace primary
switch with proper
replacement part.
• Replace blower
with correct
replacement part.
• Furnace not operating.
• Integrated control module
diagnostic LED is
flashing EIGHT (8)
flashes.
8 FLASHES
• Problem with
igniter circuit.
• Improperly connected
igniter.
• Bad igniter.
• Poor unit ground.
• Poor burner ground.
• Faulty integrated control
module.
• Check and correct wiring
from integrated control
module to igniter.
•Replace bad igniter.
•Check and correct unit
ground wiring.
• Replace bad integrated
control module.
• Turn power OFF
prior to repair.
• Replace igniter
with proper
replacement part.
• Read precautions
in “Electrostatic
Discharge”
section of manual.
ON
Cautions
& Notes
Corrective Action
Possible Causes
Fault
Description(s)
Symptoms of
Abnormal Operation
Associated
LED Code
2