45
■
No furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
6 flashes.
6 flashes
■
Rollout limit
switch open.
■
Integrated
control module
fuse is blown.
■
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
switch.
■
Check burners for
proper alignment.
■
Check flue and air inlet
piping for blockage,
proper length, elbows
and termination.
Correct as necessary.
■
Check rollout limit
switch. 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).
■
Turn off power
prior to repair.
■
Replace induced
draft blower with
correct
replacement part.
■
Replace
integrated control
module fuse with
3A automotive
fuse.
■
Read precautions
in “Electrostatic
Discharge (ESD)
Precautions”
section of
manual.
■
Replace rollout
limit switch with
correct
replacement part.
■
See “Vent/Flue
Pipe” section for
piping details.
■
Normal furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
7 flashes.
7 flashes
■
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 if
coated/oxidized.
■
Inspect for proper
sensor alignment.
■
Compare current gas
pressure to rating plate
info. Adjust as needed.
■
Turn off power
prior to repair.
■
Sand flame
sensor with
emery cloth.
■
See “Vent/Flue
Pipe” section for
piping details.
■
See rating plate
for proper gas
pressure.
■
No furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
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
furnace ground wiring.
■
Replace faulty
integrated control
module.
■
Turn off power
prior to repair.
■
Replace igniter
with correct
replacement part.
■
Replace
integrated control
module with
correct
replacement part.
■
Read precautions
in “Electrostatic
Discharge (ESD)
Precautions”
section of
manual.
■
Induced draft
blower runs
continuously.
No furnace
operation.
■
Integrated
control module
diagnostic LED
is flashing
continuously.
Continuous
flashes
■
Polarity of
115-volt 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 off power
prior to repair.
Symptoms of
Abnormal
Operation
Associated
LED Code
Fault Description Possible Causes
Corrective Actions
Notes and
Cautions