GMES80 Installation Manual

30
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• Circulator blower runs
continuously. No furnace operation.
• Integrated control
module diagnostic LED is
flashing
FOUR (4) flashes.
4 FLASHES
• Primary or auxiliary
limit circuit is open.
• Faulty primary or
auxiliary limit switch.
• Insufficient conditioned
air over the heat
exchanger. Blocked
filters, restrictive
ductwork, improper
circulator blower speed,
or failed circulator
blower.
• Loose or improperly
connected wiring.
• Check primary/
auxiliary 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/
auxiliary limit with
proper replacement
part.
• Replace blower with
correct replacement
part.
Induced draft blower and
circulation blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing FIVE
(5) flashes.
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.
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing SIX
(6) flashes.
• No furnace operation.
6 FLASHES
Rollout limit 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.
• 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.
• Turn power OFF prior
to repair.
• See "Vent/Flue Pipe"
section for piping
details .
Replace induced draft
blower with correct
replacement part.
• Replace integrated
control module fuse
with 3A automotive
fuse.
Read precautions in
“Electrostatic
Discharge" s ection
of manual.
Replace rollout limit
with correct
replacement part.
• Normal furnace operation.
• Integrated control module
diagnostic LED is flashing SEVEN
(7) flashes.
7 FLASHES
• Flame sense microamp
s ig nal 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 s teel wool.
• See "Vent/Flue Pipe"
section for
piping details.
• See rating plate for
proper gas pressure.
• Furnace not operating.
• Integrated control module
diagnostic LED
is flashing EIGHT
(8) flashes.
8 FLASHES
Igniter R elay Fault
•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 & correct unit
ground wire.
• Replace bad integrated
control module.
• Turn power OFF prior
to repair.
• Replace igniter
w/proper replacement
part.
Read precautions in
“Electrostatic
Discharge" s ection
of manual.
4
5
6
7
1
Integrated control module will automatically attempt to reset from lockout after one hour.
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.