Maytag Amana CES80 Series, Manual

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30
TROUBLESHOOTING CHART PCBBF145 CONTROL BOARD
Symptoms of
Abnormal
Operation
Associated
LED Code
2
Fault
Description(s)
Possible Causes Corrective Action
Cautions
and Notes
• Circulator blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic LED is
flashing
FOUR (4) flashes.
4 FLASHES
• Primary or
auxiliary limit
circuit is open.
• 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.
• Check primary/ auxiliary limit.
Replace if necessary.
• Check filters and ductwork for
blockage. Clean filters or
remove
obstruction.
• Check circulator blower speed
and performance. Correct
speed
or replace blower if necessary.
• Tighten or correct.
• Turn power OFF
prior to repair.
• Replace primary/
auxiliary limit with
proper replacement
part.
• Replace blower with
correct replacement
part.
• Induced draft blower and
circulation blower runs
continuously. No furnace
operation.
• Integrated control module
diagnostic
LED
is
flashing
FIVE (5) flashes.
5 FLASHES
• Flame sensed
with no call for
heat.
• Short to ground in flame sense
circuit.
• Correct short at flame sensor or
in flame sensor wiring.
• Turn power OFF
prior to repair.
• Furnace fails to operate.
• Integrated control module
diagnostic
LED
is
flashing
SIX (6) flashes.
• No furnace operation.
6 FLASHES
• Rollout limit
open.
• Integrated
control module
fuse is blown.
• Flame rollout.
• Misaligned burners, blocked flue,
or failed induced draft blower.
• Loose or improperly connected
wiring.
• Short in 24 volt AC control circuits
or safety circuits.
• Faulty rollout limit.
• Check burners for proper
alignment.
• Check flue for blockage, proper
length, elbows, and termination.
Correct as necessary.
• Check rollout limit. Replace if
necessary.
• Check induced draft blower for
proper performance. Replace, if
necessary.
• Tighten or correct wiring
connection.
• Turn power OFF
prior to repair.
• See "Vent/Flue
Pipe"
section for piping
details.
• Replace induced
draft blower with
correct replacement
part.
• Replace integrated
control module fuse
with 3A automotive
fuse.
• Read precautions in
“Electrostatic
Discharge" section
of
manual.
• Replace rollout limit
with correct
• Normal furnace
operation.
• Integrated control module
diagnostic LED is
flashing
SEVEN (7) flashes.
7 FLASHES
• Flame sense
microamp
signal
is low.
• Flame sensor is coated/oxidized.
• Flame sensor incorrectly
positioned
in burner flame.
• Lazy burner flame due to
improper
gas pressure or combustion air.
• Sand flame sensor.
• Inspect for proper sensor
alignment.
• Compare current gas pressure
to
rating plate info. Adjust as
needed.
• Turn power OFF
prior to repair.
• Clean flame sensor
with steel wool.
• See "Vent/Flue
Pipe"
section for piping
details.
• See rating plate for
proper gas
• Furnace not operating.
• Integrated control module
diagnostic LED is
flashing
EIGHT
(8) flashes.
8 FLASHES
• Igniter Relay
Fault.
• Improperly connected igniter.
• Bad igniter.
• Poor unit ground.
• Poor burner ground.
• Faulty integrated control module.
• Check and correct wiring from
integrated control module to
igniter.
• Replace bad igniter.
• Check & correct unit ground
wire.
• Replace bad integrated control
module.
• Turn power OFF
prior to repair.
• Replace igniter
w/proper
replacement part.
• Read precautions in
“Electrostatic
Discharge" section
of
manual.
4
5
6
7
8
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.