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Diagnostic Chart; Warning - Whirlpool WGFM29 Installation Instructions Manual

93% and 95% 2-stage variable-speed gas furnace
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Goodman 118 Long
To avoid personal injury or death due to electrical shock, disconnect electrical power
before performing any service or maintenance.
The dual 7-segment LED display will display an error code that may contain a letter and number. The error code may be used to assist
in troubleshooting the unit.
Symptoms of
Diagnostic/
Abnormal
Status LED
Operation
Code
Furnace fails to
None
operate.
Integrated
control module
diagnostic LED
display
provides no
signal.
LED display
OP
indicates "OP."
Furnace fails to
E0
operate.
Integrated
control module
LED display
provides "E0"
error code.

Diagnostic Chart

WARNING

HIGH VOLTAGE!
Fault Description Possible Causes
No 115-volt
Manual disconnect
power to
switch Off, door
furnace, or no
switch open or
24-volt power to
24-volt wire
integrated
improperly
control module.
connected or
loose.
Blown fuse or
circuit breaker.
Blown fuse or
circuit breaker
Internal fault in
Integrated
Integrated control
control module.
module has an
internal fault.
Normal
Normal operation
operation
Furnace lockout
Failure to establish
due to an
flame. Cause may
excessive
be no gas to
number of
burners, front cover
ignition "retries"
pressure switch
(3 total).
stuck open, bad
igniter or igniter
alignment,
improper orifices or
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 combustion
air piping), front
cover pressure
switch opening, or
improper induced
draft blower
performance.
Corrective Actions
Assure 115-volt power
to the furnace, and 24-
volt power to
integrated control
module
Check integrated
control module fuse.
Replace with 3A
automotive fuse, if
necessary.
Check for possible
shorts in 115-volt and
24-volt circuits. Repair
as necessary.
Replace bad
integrated control
module.
None
Locate and correct gas
interruption.
Check front cover
pressure switch
operation (hose,
wiring, contact
operation). Correct if
necessary.
Replace or realign
igniter. Igniter is fragile,
handle gently.
Check flame sense
signal. Sand sensor if
coated and/or
oxidized.
Check flue piping for
blockage, proper
length, elbows and
termination.
Verify proper induced
draft blower
performance.
Notes and Cautions
Turn off power prior to
repair.
Replace integrated
control module fuse
with 3A automotive
fuse.
Read precautions in
"Electrostatic
Discharge" section of
manual.
Replace integrated
control module with
current replacement
parts.
Normal operation
Turn off power prior to
repair.
Igniter is fragile,
handle with care.
Sand flame sensor
with emery cloth.
See "Vent/Flue Pipe"
section for piping
details.
43

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