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13. AIR CONDITIONING TROUBLESHOOTING
WARNING!
SYMPTOM
Unit will not operate
Outdoor fan on;
Compressor off
Too little cooling
Compressor
operates in short
cycles
High head pressure;
Low suction
pressure
High head pressure;
Normal suction
pressure
AIR CONDITIONER TROUBLESHOOTING GUIDE
THIS TROUBLESHOOTING GUIDE IS INTENDED FOR USE BY
QUALIFIED SERVICE PERSONNEL ONLY!
POSSIBLE CAUSE
Power disconnected or loose
connection.
Blown fuse / breaker tripped.
Thermostat out of calibration is
set too high.
Contactor defective.
Transformer defective
High pressure control open
(if provided).
Run or start capacitor defective.
Start relay defective.
Loose wire.
Compressor stuck, grounded or open
motor winding, open internal overload.
Low voltage condition.
Improperly sized unit.
Improper indoor airflow.
Incorrect refrigerant charge.
Air, non-condensables or moisture in
system.
Incorrect voltage.
Defective overload protector.
Refrigerant undercharge.
Restriction in liquid line, expansion
device or filter drier.
Lack of sufficient indoor airflow.
Dirty outdoor coil.
Refrigerant overcharge.
Outdoor fan not running.
Air or non-condensables in system.
CORRECTION
Check power supply to unit.
Check voltage at contactor.
Replace fuses/reset breaker.
Reset.
Check for 24VAC at contactor coil -
replace if open.
Check wiring – replace transformer.
Reset – see high pressure connection.
Replace.
Replace.
Check for correct voltage at
compressor – check and tighten all
connections.
Wait at least 2 hours for overload to
reset; if still open, replace the
compressor.
Add start kit components.
Recalculate load.
Check-should be approximately
400 CFM per ton.
Charge per procedure in installation
manual.
Recover refrigerant.
At compressor terminals, voltage must
be +/10% of nameplate marking when
unit is operating.
Replace – check for correct voltage.
Add refrigerant.
Remove or replace defective
component.
Clean/check filters, registers, or
evaporator coil that may cause a
restriction.
Clean coil.
Correct system charge.
Repair or replace.
Recover refrigerant, evacuate and
recharge.
W415-2973 / B / 07.18.22
23
TABLE 4.
IOM
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