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TROUBLESHOOTING AND SERVICING GUIDE
PROBLEM PROBABLE CAUSE CORRECTION
Condensing unit will
not start - no hum.
1.LINE DISCONNECTED, SWITCH OPEN.
2.FUSE REMOVED OR BLOWN.
3.OVERLOAD PROTECTOR BLOWN.
4.CONTROL "OFF" DUE TO COLD LOCATION.
5.CONTROL STUCK IN OPEN POSITION.
6.WIRING IMPROPER OR LOOSE.
1.CLOSE START OR DISCONNECT
SWITCH.
2.REPLACE FUSE.
3.DETERMINE REASON AND
CORRECT/REPLACE
4.RELOCATE CONTROL.
5.REPAIR OR REPLACE CONTROL.
6.CHECK WIRING AGAINST DIAGRAM.
Condensing unit will
not start - hums but
trips on overload
protector.
1.IMPROPERLY WIRED.
2.LOW VOLTAGE TO UNIT.
3.STARTING CAPACITOR DEFECTIVE.
4.RELAY FAILING TO CLOSE.
5.COMPRESSOR MOTOR HAS A SHORTED OR
OPEN WINDING
.
6.INTERNAL MECHANICAL TROUBLE IN
COMPRESSOR.
7. INSUFFICIENT AIR SUPPLY
1.CHECK WIRING AGAINST DIAGRAM.
2.DETERMINE REASON AND CORRECT.
3.DETERMINE REASON AND REPLACE.
4.DETERMINE REASON AND REPLACE.
5.REPLACE COMPRESSOR.
6.REPLACE COMPRESSOR
.
7. CLEAR CONDENSER & ALLOW
COMPRESSOR TO COOL DOWN
Condensing unit starts
and runs, but short
cycles on over-load
protector.
1.ADDITIONAL CURRENT PASSING THROUGH
OVERLOAD PROTECTOR.
2.LOW VOLTAGE TO UNIT.
3.OVERLOAD PROTECTOR DEFECTIVE.
4.RUN CAPACITOR DEFECTIVE.
5.EXCESSIVE DISCHARGE PRESSURE.
6.EXCESSIVE SUCTION PRESSURE.
7.INSUFFICIENT AIR SUPPLY
1.CHECK WIRE DIAGRAM.CHECK FOR
ADDED COMPONENTS CONNECTED TO
WRONG SIDE OF OVERLOAD
PROTECTOR.
2.DETERMINE REASON AND CORRECT.
3.CHECK CURRENT,REPLACE
PROTECTOR.
4.DETERMINE REASON AND REPLACE.
5.CHECK VENTILATION,RESTRICTIONS IN
COOLING MEDIUM OR REFRIG. SYSTEM.
6.CHECK FOR MISAPPLICATION.
7.CLEAR CONDENSER & ALLOW
COMPRESSOR TO COOL DOWN
Condensing unit starts,
but fails to switch off of
"start" winding.
1.IMPROPERLY WIRED.
2.LOW VOLTAGE TO UNIT.
3.RELAY FAILING TO OPEN.
4.RUN CAPACITOR DEFECTIVE.
5.EXCESSIVELY HIGH DISCHARGE PRESSURE.
6.COMPRESSOR MOTOR HAS A SHORTED OR
OPEN WINDING.
7.INTERNAL MECHANICAL TROUBLE IN
COMPRESSOR.
1.CHECK WIRING AGAINST DIAGRAM.
2.DETERMINE REASON AND CORRECT.
3.DETERMINE REASON AND REPLACE.
4.DETERMINE REASON AND REPLACE.
5.CHECK DISCHARGE SHUT-OFF VALVE,
POSSIBLE OVERCHARGE.
6.REPLACE COMPRESSOR.
7.REPLACE COMPRESSOR.