18
Trouble Shooting Guide Continued
Circuit breaker or fuses blowing 1 Low voltage to unit. 1 Check power supply for proper voltage at unit plus or minus 10
of rated nameplate voltage.
2 Compressor short cycles 2 See section on compressor troubleshooting.
3 Defective wiring or connection. 3 Tug on wires to see if they will separate from connections.
4 Refrigerant system not equalized (wait 5
min. before restart).
4 Compressor is starting under a load. If this condition persists, see
section on compressor troubleshooting.
5 Improper fuses or dedicated circuit. 5 Connect unit to a dedicated circuit. Check unit rating plate for
circuit amperage.
6 Grounded component. 6 Check unit components for short to ground and correct wiring or
replace component as necessary.
Electric shock from unit. 1 Grounded electric circuit. 1 An ungrounded wire or component is touching the unit casing.
Use an ohmmeter or hipot tester to find trouble. Replace or
rewire.
2 Ungrounded unit. 2 The units must be connected to a grounding system.
Cycle too long or unit operates
continuously.
1 Condenser dirty, clogged or restricted. 1 Replace condenser coil.
2 Compressor motor defective. 2 Replace compressor
3 Air or non-condensable gases in system. 3 Recover refrigerant, install filter/dryer, evacuate system and
weigh in proper charge of virgin refrigerant.
4 Capillary tube or strainer restricted. 4 Replace restricted capillary tube.
5 Compressor contactor stuck closed. 5 Replace contactor.
6 Low refrigerant charge. 6 Locate refrigerant leak, recover refrigerant, repair leak, install
filter/dryer, evacuate system and weigh in proper charge.
7 Improper unit installation. 7 Check for airflow restrictions and objects blocking front of unit
8 Unit too small for its application. 8 Replace with larger unit.
9 Leak in system 9 Locate refrigerant leak, recover refrigerant, repair leak, install
filter/dryer, evacuate system and weigh in proper charge.
10
Dirty air filter (air flow restricted) 10
Clean air filter.
COMPRESSOR TROUBLESHOOTING
Compressor starts and runs but
cycles on overload
1 Low voltage 1 Check power supply for proper voltage at unit plus
of rated nameplate voltage.
2 Capacitor incorrect or defective 2 Check capacitance and replace if necessary.
3 Condenser dirty, clogged or restricted 3 Replace condenser coil.
4 Compressor grounded 4 Check compressor windings to ground. Replace compressor if
shorted.
5 Air or non-condensable gases in system 5 Recover refrigerant, install filter/dryer, evacuate system and
weigh in proper charge of virgin refrigerant.
6 Wiring incorrect or defective 5 Tug on wires to see if they will separate from connections.
7 High head-pressure 7 Clean coils and filter, check system pressures
8 Capillary tube or strainer restricted 8 Replace restricted capillary tube.
9 Overload protector incorrect or defective 9 Replace as necessary.
10
Refrigerant overcharged 10
Recover entire refrigerant charge and weigh in proper charge.
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