• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Circulator blow er
motor senses
a loss of rotor control.
• Circulator blow er
motor senses high
current.
• Abnormal motor loading,
sudden change in speed or
torque, sudden blockage of
furnace air inlet/outlet
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Circulator blow er
motor fails to start 10
consecutive times.
• Obstruction in circular
blow housing.
• Seized circular blow er
motor bearings
• Failed circular blow er
motor.
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
•
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.
• High AC line voltage to
furnace.
• Low AC line voltace to
furnace.
• High ambient temperatures.
• Furnace fails to operate.
• Integrated control module LED
display provides
error
code.
•
Circulator blow er
motor does not have
enough information to
operate properly.
Motor fails to start 40
consecutive times.
• Error w ith integrated
control module. Motor has a
rotor condition.
• Furnace operates at
reduced performance or
operates on low stage w hen
high stage is expected.
• Integrated control module LED
display provides
error code.
•
Airflow is low er than
demanded.
• Blocked filters.
• Restrictive ductw ork.
• Undersized ductw ork.
• Check integrated control module.
Verify control is populated w ith
correct shared data set. See data
errors above for details. Check for
locked rotor condition ( see error
code above for details).
• Turn pow er off prior to
repair.
• Check filters for blockage. Clean
filters or remove obstruction.
• 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.
• Turn pow er OFF prior to
repair.
• Check filters, filter grills/registers,
duct system, and furnace air
inlet/outlet for blockages.
• Turn pow er OFF prior to
repair
• Check circular blow er for
obstructions. Remove and
repair/replace w heel/motor if
necessary
• Turn pow er OFF prior to
repair.
• Replace motor w ith correct
replacement part.
• Replace w heel w ith correct
replacement part.
• Check pow er to furnace. Verify
line voltage to furnace is w ithin the
range specified on the furnace
rating plate. See "III. Product
description" and IV Location
Requirements and Considerations"
furnace installation requirements.
• Turn pow er OFF prior to
repair.
• Replace motor w ith correct
replacement part.
• Use memory card for the
specifc model.
Symptoms of Abnormal
Operation
Diagnostic /
Status LED
Codes
Possible Causes
Corrective Actions
Notes & Cautions
Fault Description
TROUBLESHOOTING
51
