Amana GMES80 Service Instructions Manual page 37

TROUBLESHOOTING
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
circulation blower runs
continuously. No furnace
operation.
• Integrated control
module diagnostic LED
is flashing FIVE (5)
flashes.
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control mod-
ule diagnostic LED is
flashing SIX (6) flashes.
• Normal furnace opera-
tion.
• Integrated control
module diagnostic LED
is flashing SEVEN (7)
flashes.
• Furnace fails to operate.
• Integrated control mod-
ule diagnostic LED is
flashing continuously.
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.
Fault Description(s)
Associated
LED Code
2
• Primary limit circuit
is open.
4
4 FLASHES
• Flame sensed with
no call for heat.
5
5 FLASHES
• Rollout limit circuit is
open.
6
6 FLASHES
• Flame sense micro-
amp signal is low.
7
7 FLASHES
• Polarity of 115 or
24 volt power is
C
reversed.
CONTINUOUS/
RAPID FLASH
PCBBF145(S) CONTROL BOARD
Possible Causes
• Faulty primary limit switch.
• Insufficient conditioned air
over the heat exchanger.
Blocked filters, restrictive
ductwork, improper circula-
tor blower speed, or failed
circulator blower.
• Loose or improperly con-
nected 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 con-
nected wiring.
• 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.
• Polarity of 115 volt AC pow-
er to furnace or integrated
control module is reversed.
• Orange and gray wires to
transformer are reversed.
• Poor unit ground.
Corrective Action
• Check primary limit.
• Turn power OFF
Replace if necessary.
• Check filters and
• Replace primary
ductwork for blockage.
Clean filters or remove
obstruction.
• Replace blow-
• Check circulator 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 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, prop-
Pipe" section for
er length, elbows, and
piping details.
termination. Correct as
• Replace rollout
necessary.
limit with correct
• Check rollout limit. Re-
replacement part.
place if necessary.
• Replace induced
• Check induced draft blow-
draft blower with
er for proper performance.
correct replace-
Replace, if necessary.
ment part.
• Tighten or correct wiring
connection.
• Turn power OFF
• Clean flame sensor if
coated/oxidized. prior to repair.
• Inspect for proper sensor • Clean flame sen-
sor
alignment.
• See "Vent/Flue
• Check inlet air piping for
blockage, proper length, Pipe" section for
piping details.
elbows, and termination.
• See rating plate
• Compare current gas
pressure to rating plate for proper gas
info. Adjust as needed. pressure.
• Review wiring diagram • Turn power OFF
to correct polarity. prior to repair.
• Reverse orange and
gray wires going to
transformer.
• Verify proper ground.
Correct if necessary.
Cautions and
Notes
prior to repair.
limit with proper
replacement part.
er with correct
replacement part.
37