AVPTC ComfortBridge Air Handler Installation and Operation Manual

17
26 Air Handler Troubleshooting Matrix
Symptoms of Abnormal Operation
Diagnostic /
Status LED
Codes
Fault Description Possible Causes Corrective Actions
No outdoor unit operations 
Communication error with
outdoor unit
Improper low vol tage wiring
between the indoor and outdoor u nit
Outdoor control board lost power
duirng operation
Locate an d correct i mprop er low vol tag e
wiri ng issue
Identif y reason outdoor control board lost
power during operation
No Air Handler operation  Open fuse Short in low voltage wiring
Locate and correct short in low voltage
wiri ng
Replace fuse with 3-amp automotive type
No Air Handler operation 
Auxilary switch (condensate
switch) open
High water level in the evaporation
coil
Check evaporator drai n pan, trap, piping
No Air Handler operation  Data not yet on network No network data
Populate shared data set using memory
card
No Air Handler operation  Invalid memory card data
Air Handler blower does not contain
an appropriate shared data set
Populate correct shared data using memory
card
Operation dif ferent than expected or no
operation
 Invalid memory card data
Shared data set on memory card
has been rejected by integrated
control module
Verify shared data set is correct for the
specifc model. Re-populate data using
correct memory card if required
No Air Handler operation 
Circulator blower motor not
running with demand present
Loose or disconnected wiring
connection at circulator motor power
leads
Open circuit in inductor or loose
wiring connection at inductor (3/4
Hp and 1 Hp models only)
Failed circulator blower motor
Tighten or correct wiring connection
Verify continuous circuit through inductor.
Replace if open or short circuit
Check circulator blower motor
No Air Handler operation 
Integrated control module has
lost communications with
circulator blower motor
Loose wiring con nection 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
No Air Handler operation 
Circulator blower motor horse
power in shared data set does
not match circulator blower
motor horse power
Incorrect circulator blower motor in
Air Handler
Incorrect shared data set in
integrated control module
Verify circulator blower if motor horse power
is the same specifed f or the specifc Air
Handler model, replace if necessary
Verify shared data set is correct for the
specifc model, re-populate data using
correct memory card if required
Air Handler operates at reduced
performance
Airfow delivered is less than expected

Circulator blower motor i s
operating in a power,
temperature, or speed limiting
condition
Blocked flters
Restrictive or undersized ductwork
Hi gh amb ient temperatures
Check f ilters for blockage, clean f lters or
remove obstruction
Check ductwork for blockage, remove
obstruction and verify all registers are fully
open
Verify ductwork is appropriately sized for
system and resize/replace ass needed