Common Central Air Conditioning Problems & Troubleshooting

Common Central Air Conditioning Problems & Solutions

  1. Condenser unit doesn’t turn on
  2. Condenser unit doesn’t turn off
  3. Air conditioner does not cool
  4. Condenser unit noisy
  5. Air conditioner turns on and off frequently
  6. Frost on evaporator coils
  7. Water leaking inside furnace

Condenser unit doesn’t turn on

Possible causeProcedure
No power to unitReplace fuse or reset circuit breaker
Restore power at outdoor unit disconnect switch
Thermostat set too highLower thermostat settings
Outdoor temperature sensor faultyCall for service
High-pressure switch faultyCall for service
Capacitor faultyDischarge capacitor, test, and replace if necessary
Compressor or fan motor faultyCall for service
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Condenser unit doesn’t turn off

Possible causeProcedure
Contactor dirty or faultyClean contactor, test, and replace if necessary
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Air conditioner does not cool

Possible causeProcedure
Thermostat set too highLower the thermostat settings
Fan not cooling condenser coilsCall for service
High-pressure switch faultyCall for service
Condenser coils blocked with dirt or grassClean coils and remove obstructions
Condenser unit blocked; air cannot circulateClear debris from around unit
Call for service to move unit
Compressor faultyCall for service
Refrigerant level lowCall for service
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Condenser unit noisy

Possible causeProcedure
Fan blades hitting bracket or grilleInspect fan blades, adjust or replace if necessary
Fan motor faultyCall for service
Access panel screws looseTighten screws
Fan motor bearings dryLubricate fan motor
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Air conditioner turns on and off frequently

Possible causeProcedure
Evaporator coils frostedRun blower in furnace with the air conditioning turned off for several hours
Refrigerant level lowCall for service
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Frost on evaporator coils

Possible causeProcedure
Blower in furnace turned offTurn on blower
Blower motor faultyCall for service
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Water leaking inside furnace

Possible causeProcedure
Evaporator drain pan cloggedClean drain pan
Evaporator drain trap blockedCall for service
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