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Whirlpool WGFD28 Installation Instructions Manual page 37

80% 2-stage variable speed gas furnace gold models
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Symptoms of
Diagnostic/
Abnormal
Staus LED
Operation
Code
Furnace fails to
b5
operate.
Integrated
control module
LED display
provides "b5"
error code.
Furnace fails to
b6
operate.
Integrated
control module
LED display
provides "b6"
error code.
Furnace fails to
b7
operate.
Integrated
control module
LED display
provides "b7"
error code.
Furnace
b9
operates at
reduced
performance or
operates on low
stage when
high stage is
expected.
Integrated
control module
LED display
provides "b9"
error code.
Fault Description Possible Causes
Circulator
Obstruction in
blower motor
circulator blower
fails to start
housing.
10 consecutive
Seized circulator
times.
blower motor
bearings.
Failed circulator
blower motor.
Circulator
High AC line
blower motor
voltage to furnace.
shuts down for
Low AC line
over or under
voltage to furnace.
voltage
High ambient
condition.
temperatures.
Circulator
blower motor
shuts down due
to over
temperature
condition on
power module.
Circulator
Error with
blower motor
integrated control
does not have
module.
enough
Motor has a locked
information to
rotor condition.
operate
properly.
Motor fails
to start
40 consecutive
times.
Airflow is lower
Blocked filters.
than demanded.
Restrictive
ductwork.
Undersized
ductwork.
Corrective Actions
Check circulator
blower for
obstructions. Remove
and repair/replace
wheel/motor, if
necessary.
Check circulator
blower motor shaft
rotation and motor.
Replace motor if
necessary.
Check power to
furnace. Verify line
voltage to furnace is
within the range
specified on the
furnace rating plate.
See "Product
Description" and
"Location
Requirements and
Considerations" for
furnace installation
requirements.
Check integrated
control module. Verify
control is populated
with correct shared
data set. See data
errors above for
details.
Check for locked rotor
condition (see error
code above for
details).
Check filters for
blockage. Clean filters
or remove obstruction.
Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
Notes and Cautions
Turn off power prior to
repair.
Replace motor with
correct replacement
part.
Replace wheel with
correct replacement
part.
Turn off power prior to
repair.
Turn off power prior to
repair.
Replace with correct
replacement part(s).
Use memory card for
the specific model.
Turn off power prior to
repair.
37

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