TROUBLESHOOTING
When any air-conditioner malfunction is noted, immediately switch off the power supply to the unit,
and contact the local dealer, if necessary. Some simple troubleshooting tips are given below.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Low voltage
Check for voltage at compressor.
Will operate at 10% voltage variance.
Thermostat not set cold enough or
inoperative.
Set thermostat to coldest position.
Test thermostat and replace if
inoperative.
Compressor hums but cuts off on
overload
Hard start compressor. Direct test
compressor. If compressor starts,
add starting components.
Open or shorted compressor
windings.
Check for continuity and resistance.
Open overload.
Tests overload protector and replace
if inoperative.
Open capacitor.
Test capacitor and replace if
inoperative.
Inoperative system switch
Test for continuity in all positions.
Replace if inoperative
Compressor does not run
Broken, loose or incorrect wiring.
Refer to appropriate wiring diagram
to check wiring.
Inoperative system switch.
Test switch and replace if inoperative
Broken, loose or incorrect wiring.
Refer to applicable wiring diagram.
Open capacitor
Test capacitor and replace if
inoperative.
Fan speed switch open.
Tests switch and replace if
inoperative.
Fan motor does not run.
Inoperative fan motor
Test fan motor and replace if
inoperative(be sure internal overload
has had time to reset)
Dirty or plugged condenser or
evaporator coil.
Use steam or detergent to clean.
Does not cool, or cools only slightly.
Poor air circulation in area being
cooled.
Adjust discharge air louvers. Use
high fan speed.
