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Trouble Shooting Guide Continued
COMPRESSOR TROUBLESHOOTING
Compressor short cycles
1 Low voltage
1 Check voltage at wall outlet. Must be within 10% of nameplate
rating voltage.
2 Capacitor incorrect or defective
2 Check capacitance and replace if necessary.
3 Compressor motor defective
3 Replace compressor
4 Wiring incorrect or defective
4 Tug on wires to see if they will separate from connections.
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 Fan motor too slow.
7 Select HI speed on control panel
8 Fan motor defective.
8 Check and replace.
9 Fan blade or blower wheel stuck.
9 Check for obstruction and clear. Realign blower within housing
and tighten set screw onto fan motor shaft.
10 Low refrigerant charge.
10 Locate refrigerant leak, recover refrigerant, repair leak, install
filter/dryer, evacuate system and weigh in proper charge.
11 Refrigerant overcharged.
11 Recover entire refrigerant charge and weigh in proper charge.
12 Evaporator air flow re-circulation.
12 Clean coil and filters if necessary. Unit should have 4’ of free
space in front of it.
13 Unit missing front panel or front seals.
13 All panels must be in place and secured for proper unit operation.
14 Unit oversized for application.
14 Replace with unit of appropriate size.
Compressor starts, but stops
after a few minutes.
1 Defective compressor motor.
1 Replace compressor.
2 Defective compressor run capacitor.
2 Check capacitance and replace if necessary.
3 Check the keypad error message ES.
3 Check return air sensor and replace if necessary.
4 Loose connection in electrical circuit.
4 Trace loose wire(s) and tighten connection.
5 Refrigerant overcharged.
5 Recover entire refrigerant charge and weigh in proper charge.
6 Low refrigerant charge.
6 Locate refrigerant leak, recover refrigerant, repair leak, install
filter/dryer, evacuate system and weigh in proper charge it.
7 Condenser dirty, clogged or restricted.
7 Replace condenser coil.
8 Condensate tank right at trip point.
8 Empty tank.
9 Condenser fan running at high ESP.
9 Reduce duct length.
10 High head-pressure
10 Check for obstructions within condenser coil and replace as
necessary.
Compressor starts and runs but
fan does not run.
1 Open fan motor contactor circuit.
1 Check and replace fan motor contactor as necessary.
2 Shorted or open fan motor.
2 Replace motor.
3 Fan motor capacitor incorrect or defective
3 Check capacitance and replace if necessary.
