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IOM
IOM
W415-2288 / 08.29.2019
8. TROUBLESHOOTING
8.1 AIR CONDITIONING TROUBLESHOOTING
AIR CONDITIONING TROUBLESHOOTING GUIDE
WARNING!
THIS TROUBLESHOOTING GUIDE IS INTENDED FOR USE BY
QUALIFIED SERVICE PERSONNEL ONLY!
FAULT CONDITION POSSIBLE CAUSE CORRECTION
Unit will not
operate.
Power disconnected or loose
connection
Check power supply to unit
Check voltage at contactor in condensing unit
Blown fuse / breaker tripped Replace fuses/reset breaker.
Thermostat out of calibration/is set
too high
Reset
Contactor defective Check for 24VAC at contactor coil, replace if open
Transformer defective Check wiring – Replace transformer
High pressure control open
(if provided)
Reset – See high pressure connection
Outdoor fan ON;
Compressor OFF
Run or start capacitor defective
Loose wire
Check for correct voltage at compressor – check
and tighten all connections
Compressor stuck, grounded or open
motor winding, open internal
Wait at least 2 hours for overload to reset; if still
open, replace the compressor
Outdoor fan OFF;
Compressor OFF
Loose connection Check the wiring and make sure they are tight
Blown fuse on compressor branch
circuit
With power OFF, test continuity across fuse holder.
Replace t he fuse with same fuse size and type.
Defective Contactor
With power OFF, test continuity of contactor coil
contacts. Replace is defective.
Defective Run Capacitor
With power OFF, test continuity. Replace capacitor
if defective
Indoor Blower OFF
Loose wiring connection
Check wiring connections and make sure they are
all tight.
Blown fuse on indoor blower branch
circuit
With power OFF, test continuity. Replace with
same fuse size and type.
Too little cooling
Check-should be approximately 400 CFM per ton
Incorrect refrigerant charge
Charge per procedure in installation manual
Air, non-condensables or moisture in
system
Recover refrigerant
Condenser fan not operating
Check wiring connections. Check fan motor
Condenser coil plugged with debris
Remove the unit and clean coil.
TABLE 8.
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