Service manual
19
Voltage
Check voltage. Call Supply Authority if not within limits.
Wiring
Check the wire connections, if loose, repair or replace the terminal. If wires are off,
refer to wiring diagram for identification, and replace. Check wire locations. If not per
wiring diagram, correct.
Main switch failure
Check and replace the main switch if failure.
Capacitor (Discharge capacitor
before testing)
Check the capacitor.
Replace if not /-10% of manufacturers rating. Replace if shorted, open, or
damaged.
Thermostat
Check the thermostat setting if not at the coolest (in cooling mode) or the warmest
(in heating mode). Set it if not.
Compressor will not run
while fan motor runs.
Compressor
Check the compressor for open circuit or ground. If open or grounded, replace the
compressor.
Excessive noise.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to contact cabinet,
compressor, shroud and barrier.
Power supply
The input power supply voltage is too low. Call an electrician if not within limits.
The unit starts and stops
frequently.
Outdoor temperature
When the outdoor temperature is too high, the compressor will protect.
