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TROUBLESHOOTING
Sym ptom s of Abnorm al
Operation
• Furnace fails to operate.
• Integrated control module LED
display provides error code.
• Furnace fails to operate.
• Integrated control module LED
display provides error code.
• Furnace fails to operate.
• Integrated control module LED
display provides error code.
• Furnace fails to operate.
• Integrated control module LED
display provides error
code.
• Furnace operates at
reduced performance or
operates on low stage w hen
high stage is expected.
• Integrated control module LED
display provides error code.
78
Diagnostic /
Status LED
Fault Description
Codes
• Circulator blow er
motor senses
a loss of rotor control.
• Circulator blow er
motor senses high
current.
• Circulator blow er
motor fails to start 10
consecutive times.
•
Circulator blow er
motor shuts dow n for
over or under voltage
condition.
•
Circulator blow er
motor shuts dow n
due to over
temperature condition
on pow er module.
•
Circulator blow er
motor does not have
enough information to
operate properly.
Motor fails to start 40
consecutive times.
•
Airflow is low er than
demanded.
Possible Causes
• Abnormal motor loading,
• Check filters, filter grills/registers,
sudden change in speed or
duct system, and furnace air
torque, sudden blockage of
inlet/outlet for blockages.
furnace air inlet/outlet
• Obstruction in circular
• Check circular blow er for
blow housing.
obstructions. Remove and
• Seized circular blow er
repair/replace w heel/motor if
motor bearings
necessary
• Failed circular blow er
motor.
• High AC line voltage to
• Check pow er to furnace. Verify
furnace.
line voltage to furnace is w ithin the
• Low AC line voltace to
range specified on the furnace
furnace.
rating plate. See "III. Product
• High ambient temperatures.
description" and IV Location
Requirements and Considerations"
furnace installation requirements.
• Error w ith integrated
• Check integrated control module.
control module. Motor has a
Verify control is populated w ith
rotor condition.
correct shared data set. See data
errors above for details. Check for
locked rotor condition ( see error
code above for details).
• Blocked filters.
• Check filters for blockage. Clean
• Restrictive ductw ork.
filters or remove obstruction.
• Undersized ductw ork.
• Check ductw ork for blockage.
Remove obstruction. Verify all
registers are fully open.
• Verify ductw ork is appropriately
sized for system. Resize/replace
ductw ork if necessary.
Corrective Actions
• Turn pow er OFF prior to
repair
• Turn pow er OFF prior to
repair.
• Replace motor w ith correct
replacement part.
• Replace w heel w ith correct
replacement part.
• Turn pow er OFF prior to
repair.
• Replace motor w ith correct
replacement part.
• Use memory card for the
specifc model.
• Turn pow er off prior to
repair.
• Turn pow er OFF prior to
repair.
Notes & Cautions
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