Amana GMSS9 Series Service Instructions Manual page 44

TROUBLESHOOTING
Symptoms of Abnormal
Associated
Operation
LED Code
• Circulator blower runs
continuously. No
furnace operation.
• Integrated control
module diagnostic LED
is flashing FOUR (4)
flashes.
• Induced draft blower
and circulation blower
runs continuously. No
furnace operation.
• Integrated control
module diagnostic LED
is flashing FIVE (5)
• Circulator blower runs
continuously. No
furnace operation.
• Integrated control
module diagnostic LED
is flashing SIX (6)
flashes.
• Normal furnace
operation.
• Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
• Furnace fails to
operate.
• Integrated control
module diagnostic LED
CONTINUOUS/
is flashing continu-
RAPID FLASH
ously.
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.
44
Fault
Description(s)
2
• Primary or auxiliary
limit circuit is open.
• Flame sensed with
no call for heat.
5
• Rollout limit circuit is
open/Control board
6 fuse open.
• Flame sense
microamp signal is
7
low.
• Polarity of 115 or
24 volt power is
C
reversed.
Possible Causes
• 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.
• 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.
•Faulty rollout limit.
• Short in thermostat wiring.
• Control board fuse.
• Flame sensor is coated/
oxidized.
• Flame sensor incorrectly
positioned in burner flame.
• Lazy burner flame due to
improper gas pressure or
combustion air.
• Polarity of 115 volt AC
power to furnace or
integrated control module
is reversed.
• Orange and gray wires to
transformer are reversed.
• Poor unit ground.
Corrective Action
Cautions and
• Turn power OFF
• Check primary/auxiliary
prior to repair.
limit. Replace if
necessary.
• Replace primary/
auxiliary limit with
• Check filters and
proper replace-
ductwork for blockage.
ment part.
Clean filters or remove
obstruction.
• Replace blower
with correct
• Check circulator blower
replacement part.
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 prior to repair.
sensor wiring.
• Check burners for proper
• Turn power OFF
alignment.
prior to repair.
• Check flue and air inlet
• See "Vent/Flue
piping for blockage,
Pipe" section for
proper length, elbows,
piping details.
and termination. Correct
• Replace rollout
as necessary.
limit with correct
• Check rollout limit.
replacement part.
Replace if necessary.
• Replace induced
• Check induced draft
draft blower with
blower for proper
correct replace-
performance. Replace,
ment part.
if necessary.
• Replace control
• Tighten or correct wiring
board fuse.
connection.
• Turn power OFF
• Clean flame sensor if
prior to repair.
coated/oxidized.
• Clean flame
• Inspect for proper
sensor.
sensor alignment.
• See "Vent/Flue
• Check inlet air piping for
Pipe" section for
blockage, proper length,
piping details.
elbows, and termination.
• See rating plate
• Compare current gas
for proper gas
pressure to rating plate
pressure.
info. Adjust as needed.
• Review wiring • Turn power OFF
diagram to correct prior to repair.
polarity.
• Reverse orange and
gray wires going to
transformer.
• Verify proper ground.
Correct if necessary.
Notes