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Amana GDH8 Installation Instructions Manual: T Roubleshooting

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T
ROUBLESHOOTING
Symptoms of
Abnormal Operation
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FOUR (4) flashes.
• Induced draft blower and
circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is flashing
FIVE (5) 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.
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
C
HART
Associated
Fault
Associated
LED Code
2
Description(s)
LED Code
2
• Primary limit
circuit is open.
4
4 FLASHES
• Flame sensed
5
with no call for
heat.
5 FLASHES
• Rollout limit open.
6
• Integrated control
module fuse is
blown.
6 FLASHES
• Flame sense
microamp signal is
7
low.
7 FLASHES
Possible Causes
• 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.
• Short to ground in flame
sense circuit.
• 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.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner
flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
37
Corrective Action
• Check primary limit.
• Turn power OFF
Replace if necessary.
• Check filters and
• Replace primary
ductwork for blockage.
Clean filters or remove
obstruction.
• Check circulator blower
• Replace blower
speed and performance.
Correct speed or replace
blower if necessary.
• Tighten or correct wiring
connection.
• Correct short at flame
• Turn power OFF
sensor or in flame
sensor wiring.
• Check burners for proper
• See "Vent/Flue Pipe"
alignment.
• Check flue and air inlet
• Replace induced
piping for blockage,
proper length, elbows,
and termination. Correct
as necessary.
• Check rollout limit. Replace
• Replace integrated
if necessary.
• Check induced draft
blower for proper
performance. Replace, if
• Read precautions in
necessary.
• Tighten or correct wiring
connection.
• Repair short in 24 volt AC
control/safety circuit(s).
• Replace rollout limit
• Replace integrated control
module fuse (3A).
• Sand flame sensor.
• Turn power OFF
• Inspect for proper sensor
alignment.
• Clean flame sensor
• Compare current gas
• See "Vent/Flue
pressure to rating plate
info. Adjust as needed.
• See rating plate for
Cautions
& Notes
prior to repair.
switch with proper
replacement part.
with correct
replacement part.
prior to repair.
section for piping
details.
draft blower with
proper replacement
part.
control module fuse
with 3A automotive
fuse.
"Electrostatic
Discharge" section
of manual.
with correct
replacement part.
prior to repair.
with steel wool.
Pipe" section for
piping details.
proper gas
pressure.

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