AVPTC Installation Instructions ComfortBridge

18
26 AirHandlerTroubleshoongMatrix(connued)
Symptoms of Abnormal
Operation
Diagnostic /
Status LED
Codes
Fault Description
Possible Causes
Corrective Actions
No Air Handler operation

Circulator blower motor
senses a loss of rotor
control
Circulator blower motor
senses high current
Abnormal motor loading,
sudden change in speed or
torque, sudden blockage of air
handler air inlet or outlet
Check filters, filter grills/registers,
duct system and air handler
inlet/outlet for blockages
No Air Handler operation 
Circulator blower motor
fails to start 10
consecutive times
Obstruction in circulator
blower housing
Seized Circulator blower
motor bearings
Failed circulator blower motor
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
No Air Handler operation 
Circulator blower motor
shuts down for over or
under voltage condition
Circulator blower motor
shuts down due to over
temperature condition on
power module
High or low AC line voltage to
air handler
High ambient temperatures
Check power to air handler
Verify line voltage is within the range
specified on the rating plate
No Air Handler operation 
Circulator blower motor
does not have enough
information to operate
properly
Motor fails to start 40
consecutive times
Error with integrated control
module shared data
Verify control is populated with the
correct shared data
Air Handler operates at reduced
performance or operates on low
stage when high stage is expected

Airflow is lower than
demanded
Blocked filters or restrictive
ductwork
Undersized ductwork
Check filters for blockage, clean
filters or remove obstruction
Check ductwork for blockage,
remove obstruction and verify all
registers are fully open
Verify ductwork is appropriately sized
for system, resize/replace ductwork if
necessary