Condensing Unit, Heat Pump, Blower and Coil Service Instructions

SERVICING
52
Diag nost ic/Status LED Codes
Com fo r tNet
Thermostat Only
Symptoms of Abnormal Operation
(Legacy & ComfortNet Thermostat)
Green Yell o w Red Red Y1
Fault
Description
Me s sage Code
Possi ble Causes
Corrective Actions Notes & Cauti ons
Air conditi oner/heat pump may appear
to be operating normally.
Integrated control module
diagnostic/status LED’s display the
indicated code.
OFF 9
Fl ash es
OFF ON if call
present;
OFF i f no
call
Low Pilot
Voltage
LOW
SECOND
VOLT
09 Control detects secondary
voltage less than 18 VAC.
Transformer overloaded.
Low l ine vol tage.
Check fuse.
Correct low secondary
voltage condition.
Check transformer;
replace if needed.
Turn power OFF prior
to repair.
Fault will clear if
secondary voltage rises
above 21VAC.
Replace with correct
replacement part(s).
Co mpressor is off.
Integrated control module
diagnostic/status LED’s display the
indicated code.
OFF ON ON ON if call
present;
OFF i f no
call
Comp Protector
Open
Not di sp layed
Not
dis pla yed
No current through run or
start windings.
Compressor run winding
is ope n.
Compressor not properly
wired to control.
Faulty compressor wiri ng.
Failed compressor run
capacitor.
Faulty run capacitor
wiri n g.
Check compressor;
repair/replace as
needed.
Check wiring;
repair/replace as
needed.
Check run capacitor;
replace as needed.
Turn power OFF prior
to repair.
Fault will clear after 1
no r mal cycle.
Faul t may be cleared by
cycling 24VAC to
control.
Replace with correct
replacement part(s).
PCBHR101-103
PBBGR101-102