Troubleshooting Chart - Maytag Amana MES80 Series Manual

TROUBLESHOOTING CHART

Symptoms of
Associated
Abnormal
LED Code
Operation
• Furnace fails to
operate.
• Integrated control
module diagnostic
LED provides no
signal.
• LED is Steady On.
CONTINUOUS ON
• Furnace fails to
operate.
• Integrated control
module diagnostic
LED is flashing ONE
(1) flash.
1 FLASH
• Furnace fails to
operate.
• Integrated control
module diagnostic
LED is flashing TWO
(2) flashes.
2 FLASH
• Induced draft blower
runs continuously
with
no further furnace
operation.
• Integrated control
module diagnostic
LED is flashing
THREE (3) flashes.
3 FLASH
1
Integrated control module will automatically attempt to reset from lockout after one hour.
Integrated control module will automatically attempt to reset from lockout after one hour.
1
2
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
2
Fault Description(s)
2
• No 115 volt power to
furnace, or no 24 volt
power to integrated
control
module.
• Blown fuse or circuit
OFF
breaker.
• Integrated control module
has an internal fault.
• Normal Operation.
ON
• Furnace lockout due to an
excessive number of
ignition "retries" (3 total)
1
• Pressure switch circuit is
closed.
• Induced draft blower is not
2
operating.
• Pressure switch circuit
not
closed.
3
• Induced draft blower is
operating.
PCBBF145 CONTROL BOARD
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, bad igniter or igniter
1
.
alignment, improper orifices,
coated/oxidized or improperly
connected flame sensor.
• Loss of flame after
establishment. Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue)
and/or improper induced draft
blower performance.
• Induced draft blower pressure
switch contacts sticking.
• Shorts in pressure switch
circuit.
• Pressure switch hose blocked,
pinched or connected
improperly.
• Blocked flue or weak induced
draft blower.
• Incorrect pressure switch
setpoint or malfunctioning
switch
contacts.
• Loose or improperly connected
wiring.
29
Corrective Action
• Assure 115 and 24 volt • Turn power OFF
power to furnace prior
integrated control module. to repair.
• Check integrated control • Replace integrated
module fuse (3A). Replace control module fuse
if necessary. with 3A automotive
• Check for possible shorts fuse.
in 115 and 24 volt circuits. • Read precautions in
Repair as necessary. "Electrostatic
• Replace bad integrated Discharge"
control module. section of manual.
• None. • Normal Operation.
• Locate and correct gas • Turn power OFF
interruption. prior
• Replace or realign igniter. to repair.
• Check flame sense signal. • Igniter is fragile,
Sand sensor if coated handle with care.
and/or oxidized. • Sand flame sensor
• Check flue piping for with emery cloth.
blockage, proper length, • See "Vent/ Flue Pipe"
elbows, and termination. section for piping
• Verify proper induced draft details.
blower performance.
• Replace induced draft • Turn power OFF
blower pressure switch. prior
• Repair short. to repair.
• Replace pressure
switch with proper
replacement part.
• Inspect pressure switch • Turn power OFF
hose. Repair, if necessary. prior
• Inspect flue for blockage, to repair.
proper length, elbows, and • Replace pressure
termination. Correct as switch with proper
necessary. replacement part.
• Correct pressure switch
setpoint or contact motion.
• Tighten or correct wiring
connection.
Cautions
and Notes