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Trouble Shooting Guide Continued
COMPRESSOR TROUBLESHOOTING
Compressor tries to start when t-
stat closes, but cuts out on
overload; finally starts after
several attempts
1 Low voltage 1 Check voltage at wall outlet. Must be within
10% of nameplate rating voltage.
2 Compressor capacitor incorrect or defective 2 Check capacitance and replace if necessary.
3 Compressor motor requires start assist 3 Unit is equipped with hard start capacitor. Check capacitance
and replace if necessary.
4 Air or non-condensable gases in system 4 Recover refrigerant, install filter/dryer, evacuate system and
weigh in proper charge of virgin refrigerant.
5 Capillary tube or strainer restricted 5 Replace restricted capillary tube.
6 Refrigerant system not equalized. 6 The unit was programmed at the factory with a 5 minute time
delay between compressor starts. If the compressor cycles more
frequently, contact factory.
7 Discharge line restricted 7 Repair as necessary.
Compressor will not start; hums,
and cycles on overload protector
1 Low voltage 1 Check voltage at wall outlet. Must be within 10% of nameplate
rating voltage.
2 Start capacitor incorrect or defective 2
3 Compressor grounded 3 Check compressor windings to ground. Replace compressor if
shorted.
4 Compressor motor or mechanism defective 4 Replace compressor.
5 Compressor motor requires start assist 5 Unit is equipped with hard start capacitor. Check capacitance
and replace if necessary.
6 Wiring incorrect or defective 6 Tug on wires to see if they will separate from connections.
7 Refrigerant system not equalized. 7 The unit was programmed at the factory with a 5 minute time
delay between compressor starts. If the compressor cycles more
frequently, contact factory.
8 Defective compressor relay. 8 Check and replace.
9 High head-pressure. 9 Check for mineral deposits in condenser coil. Clean filter, and
check system pressures.
10
Compressor locked. 10
Replace compressor.
Will not start; no hum 1 Compressor motor defective. 1 Replace compressor.
2 Wiring incorrect or defective. 2 Tug on wires to see if they will separate from connections.
3 No power to cord connected unit. 3 Check reset button on LCDI cord at wall outlet.
4 Fuse or circuit breaker blown 4 Check unit for shorts or defective electrical parts. Correct shorts
and replace parts as necessary then replace fuse or reset circuit
breaker as necessary.
5 Overload protector tripped 5 Verify compressor is not shorted. Replace overload.
6 Thermostat contacts open 6 Lower control setting and wait 5 minutes. If still no call for
cooling, replace control board.
7 Thermostat set too high 7 Lower control setting.
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