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Maytag Amana MES9 Series Installation Instructions Manual page 42

Single-stage gas furnace, type fsp category iv direct or non direct vent air furnace
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Troubleshooting Chart PCBBF145
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
module 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 operation.
• Integrated control
module diagnostic LED is
flashing THREE (3) flashes.
Integrated control module will automatically attempt to reset from lockout after one hour.
1
LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.
2
Associated
Fault Description(s)
2
LED Code
OFF
• 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 number of
1
ignition "retries"
1 FLASH
1
(3 total)
.
• Pressure switch circuit
2
is closed.
• Induced draft blower is
2 FLASHES
not operating.
• Pressure switch circuit
not closed.
3
• Induced draft blower is
3 FLASHES
operating.
Possible Causes
Corrective Action
• Manual disconnect
• Assure 115 and 24 volt
switch OFF, door
power to furnace
switch open, or
integrated control
24 volt wires improperly
module.
connected or loose.
• Check integrated
• Blown fuse or circuit
control module fuse
breaker.
(3A). Replace if
• Integrated control
necessary.
module has an
• Check for possible
internal fault.
shorts in 115 and 24
volt circuits. Repair as
necessary.
• Replace bad integrated
control module.
• Normal Operation
• None
• Failure to establish
• Locate and correct
flame. Cause may be no
gas interruption.
gas to burners, front
• Check front cover
cover pressure switch
pressure switch
stuck open, bad igniter
operation (hose, wiring,
or igniter alignment,
contact operation).
improper orifices,
Correct if necessary.
coated/oxidized or
• Replace or realign
improperly connected
igniter.
flame sensor.
• Check flame sense
• Loss of flame after
signal. Sand sensor if
establishment. Cause
coated and/or oxidized.
may be interrupted gas
• Check flue piping for
supply, lazy burner
blockage, proper
flames (improper gas
length, elbows, and
pressure or restriction
termination.
in flue and/or
• Verify proper induced
combustion air piping),
draft blower
front cover pressure
performance.
switch opening, improper
induced draft blower
performance.
• Induced draft blower
• Replace induced draft
pressure switch
blower pressure switch.
contacts sticking.
• Repair short.
• Shorts in pressure
switch circuit.
• Pressure switch hose
• Inspect pressure switch
blocked, pinched or
hose. Repair, if
connected improperly.
necessary.
• Blocked flue and/or
•Inspect flue and/or inlet
inlet air pipe, blocked
air piping for blockage,
drain system, or weak
proper length, elbows,
induced draft blower.
and termination. Check
• Incorrect pressure
drain system. Correct as
switch setpoint or
necessary.
malfunctioning switch
• Correct pressure switch
contacts.
setpoint or contact
• Loose or improperly
motion.
connected wiring.
• Tighten or correct
wiring connection.
42
Cautions and Notes
• Turn power OFF
prior to repair.
• Replace integrated
control module fuse
with 3A automotive
fuse.
• Read precautions in
"Electrostatic
Discharge" section of
manual.
• Normal Operation
• Turn power OFF prior
to repair.
• Igniter is fragile,
handle with care.
• Sand flame sensor with
emery cloth.
• See "Vent/ Flue Pipe"
section for piping
details.
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.
• Turn power OFF prior
to repair.
• Replace pressure
switch with proper
replacement part.

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