Whirlpool WGFM29 Installation Instructions Manual page 48

Symptoms of Diagnostic/
Abnormal Status LED
Operation Code
Furnace fails to b4
operate.
Integrated
control module
LED display
provides "b4"
error 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.
48
Fault Description Possible Causes
Circulator Abnormal motor
blower motor loading, sudden
senses a loss of change in speed or
rotor control. torque, sudden
blockage of
Circulator
furnace air inlet or
blower motor
outlet.
senses high
current. High loading
conditions, blocked
filters, very
restrictive
ductwork,
blockage of
furnace air inlet or
outlet.
Circulator Obstruction in
blower motor circulator blower
fails to start 10 housing.
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 filters, filter
grills/registers, duct
system and furnace air
inlet/outlet for
blockages.
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.
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.