Troubleshooting - Amana GMES80 Service Instructions Manual

TROUBLESHOOTING

Symptoms of Abnormal
Operation
• Furnace fails to operate.
• Integrated control
module diagnostic LED
provides no signal.
• LED is Steady On.
• Furnace fails to operate.
• Integrated control mod-
ule diagnostic LED is
flashing ONE (1) flash.
• Furnace fails to operate.
• Integrated control module
diagnostic LED is flashing
TWO (2) flashes.
• Induced draft blower
runs continuously with
no further furnace opera-
tion.
• Integrated control
module diagnostic LED
is flashing THREE (3)
flashes.
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.
36
Associated
Associated Fault Description(s)
Fault Description(s)
LED Code
LED Code 2
2
NONE • No 115 volt power
to furnace, or no
24 volt power to
integrated control
module.
• Blown fuse or circuit
breaker.
• Integrated control
module has an
internal fault.
• Normal Operation
ON
CONTINUOUS
ON
• Furnace lockout
due to an excessive
1
number of ignition
"retries" (3 total)
1 FLASH
• Pressure switch
circuit is closed.
2
• Induced draft
blower is not
2 FLASHES
operating.
• Pressure switch
circuit not closed.
3
• Induced draft blower
is operating.
3 FLASHES
PCBBF145(S) CONTROL BOARD
Possible Causes
Possible Causes
• Manual disconnect switch
OFF, door switch open, or
24 volt wires improperly
connected or loose.
• Blown fuse or circuit
breaker.
• Integrated control module
has an internal fault.
• Normal Operation
• Failure to establish flame.
Cause may be no gas to
burners, pressure switch
stuck open, bad igniter or
.
1
igniter alignment, improper
orifices, or coated/oxidized
or improperly connected
flame sensor.
• Loss of flame after estab-
lishment. Cause may be
interrupted gas supply, lazy
burner flames (improper
gas pressure or restriction
in flue and/or combustion
air piping), or improper
induced draft blower perfor-
mance.
• "auxillary limit switch open"-
wired in series with the gas
valve.
• Induced draft blower
pressure switch contacts
sticking.
• Shorts in pressure switch
circuit.
• Pressure switch hose
blocked, pinched or con-
nected improperly.
• Blocked flue and/or inlet air
pipe, blocked drain system,
or weak induced draft blow-
er.
• Incorrect pressure switch
setpoint or malfunctioning
switch contacts.
• Loose or improperly con-
nected wiring.
Corrective Action
Cautions and
• Assure 115 and 24 volt
• Turn power OFF
power to furnace integrated prior to repair.
control module.
• Replace integrated
• Check integrated control control module
module fuse (3A). Replace if fuse with 3A auto-
necessary. motive fuse.
• Check for possible shorts • Read precautions
in 115 and 24 volt circuits. in "Electrostatic
Repair as necessary. Discharge" section
of manual.
• Replace bad integrated
control module.
• Normal Operation
• None
• Locate and correct gas
• Turn power
interruption.
OFF prior to
repair.
• Replace or realign igniter.
• Igniter is frag-
• Check flame sense signal.
ile, handle with
Clean sensor if coated
care.
and/or oxidized.
• Clean flame
• Check flue piping for
sensor.
blockage, proper length,
elbows, and termination.
• See "Vent/Flue
Pipe" section
• Verify proper induced
for piping
draft blower performance.
details.
• Turn power OFF
• Replace induced
prior to repair.
draft blower pressure
• Replace pressure
switch.
switch with proper
• Repair short.
replacement part.
• Inspect pressure
• Turn power
switch hose. Repair, if
OFF prior to
necessary,
repair.
• Inspect flue for block-
• Replace pres-
age, proper length, el-
sure switch
bows, and termination.
with proper
Correct as necessary.
replacement
part.
• Correct pressure
switch setpoint or
contact motion.
• Tighten or correct
wiring connection.
Notes