TROUBLESHOOTING
77
Symptoms of Abnormal
Operation
Diagnostic/
Status LED
Codes
Fault Description
Possible Causes
Corrective Action(s)
Notes & Cautions
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Integrated control
module has lost
communications with
circulator blower.
• Loose wiring connection at circulator
motor control leads.
• Failed circulator blower motor.
• Failed integrated control module.
• Tighten or correct wiring connection.
• Check circulator blower motor.
Replace if necessary.
• Check integrated control module.
Replace if necessary.
• Turn Power OFF prior to repair.
• Replace circulator motor with
correct replacement part.
• Replace integrated control
module with correct replacement
part.
• Furnace fails to operate.
• Integrated control module LED
display provides
error code.
• Circulator blower
motor horsepower in
shared data set does
not match circulator
blower motor
horsepower.
• Incorrect circulator blower motor in
furnace.
• Incorrect shared data set in
integrated control module.
• Verify circulator blower if motor
horsepower is the same specified for
the specific furnace model. Replace if
necessary.
• Verify shared data set is correct for
the specific model. Re-populate data
using the CoolCloudHVAC App if
required.
• Turn Power OFF prior to
repair.
• Replace motor with correct
replacement part.
• Error code will be cleared once
shared data and motor
horsepower match.
• Furnace operates at reduced
performance.
• Airflow delivered is less than
expected.
• Integrated control module LED
display provides
error
code.
• Circulator blower
motor is operating in a
power, temperature, or
speed limiting
condition.
• Blocked filters
• Restrictive ductwork
• Undersized ductwork
• High ambient temperatures
• 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.
• See "Ill. Product Description" and
"IV. Location Requirements &
Considerations" furnace installation
requirements.
• Turn Power OFF prior to
repair.
• Furnace fails to operate
• Integrated Control Module LED
display provides
error code
• No power to gas valve
• Verify voltage to Gas Valve
• Turn Power OFF prior to repair