28
IO-242
5/04
Troubleshooting Chart
Fault Description(s)
Symptoms of Abnormal
Operation
4
4 FLASHES
Associated
LED Code
2
• 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.
• Induced draft blower
runs continuously. No
furnace operation.
• Integrated control
module diagnostic
LED
is flashing
SEVEN
(7)
flashes.
• Induced draft blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic
LED
is flashing
continuously.
C
CONTINUOUS
FLASHING
• Primary limit
circuit is open.
• Polarity of 115
volt power is
reversed.
• Flame sense
microamp signal is
low.
• Flame sensed with
no call for heat.
• Normal operation.
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper
circulator blower speed,
or failed circulator blower.
• Flame rollout.
• Misaligned burners,
blocked flue and/or air
inlet pipe, or failed
induced draft blower.
• Loose or improperly
connected wiring.
Possible Causes
Corrective Action
Cautions and Notes
• Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
• Check circulator blower
speed and performance.
Correct speed or replace
blower if necessary.
• Check burners for proper
alignment.
• Check flue and air inlet
piping for blockage,
proper length, elbows,
and termination. Correct
as necessary.
• Check induced draft
blower for proper
performance. Replace, if
necessary.
• Tighten or correct wiring
connection.
• Turn power OFF
prior to repair.
• See Product
Data Bulletin for
allowable rise
range and proper
circulator speed.
• Polarity of 115 volt AC
power to furnace or
integrated control module
is reversed.
• Poor unit ground.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner
flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Review wiring diagram to
correct polarity.
• Verify proper ground.
Correct if necessary.
• Check and correct wiring.
• Sand flame sensor is
coated/oxidized.
• Inspect for proper sensor
alignment.
• Check inlet air piping for
blockage, proper length,
elbows, and termination.
• Compare current gas
pressure to rating plate
info. Adjust as needed.
• Turn power OFF
prior to repair.
• Turn power OFF
prior to repair.
• Sand flame
sensor with
emery clot.
• See “Vent/Flue
Pipe” section for
piping details.
• See rating plate
for proper gas
pressure.
• Correct short at flame
sensor or in flame
sensor wiring.
• Check for lingering
flame
• Verify proper operation
of gas valve
• Short to ground in flame
sense circuit.
• Lingering burner flame.
• Slow closing gas valve
• Turn power OFF
prior to repair.
• See “Vent/Flue
Pipe” section for
piping details.
• Replace pressure
switch with
proper
replacement part.
• LED is steady on
on steady
