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HomeRepair HelpComfortmaker Central A/C RepairComfortmaker Central A/C Condensing unit does not run Repair
Comfortmaker Central Air Conditioner Condensing unit does not run
If your Comfortmaker central air conditioner's condensing unit does not run, the outdoor AC unit may not be turning on because of a failed compressor, faulty wall thermostat, defective condenser fan motor, or failed fan motor. A bad run capacitor or a tripped circuit breaker or blown fuse is the most likely cause. A failed compressor is a possible but less common cause. A thermostat contact failure can prevent both the furnace and condensing unit from starting. If the condenser fan is not running, test the condenser fan motor for continuity and verify that its blades turn freely, since seized bearings can stop the motor. If the unit has power but neither the compressor nor fan runs, a sealed-system problem, low refrigerant, or tripped low-pressure switch may be preventing the condensing unit from starting. Testing components inside an outdoor AC unit involves dangerous 240V line voltage, so shut off power at the disconnect box and circuit breaker and have a qualified technician handle electrical diagnosis beyond basic inspection. Refrigerant, pressure-switch, and sealed-system repairs require EPA 608 certification. Enter your model number to find the exact Comfortmaker replacement part for your central air conditioner.
01 - Comfortmaker Central Air Conditioner Compressor
Central air conditioners use a compressor to pump refrigerant through the condenser coils located in the outside condensing unit and through the evaporator coils mounted on top of the furnace or air handler. While it's not a common problem, if the compressor fails, the condensing unit will not run. You can use a multimeter to test the compressor for electrical continuity, a continuous electrical path present in the component, to help determine if the compressor is faulty. If all other potentially defective components, such as the capacitor and condenser fan motor, are operating properly, then a qualified technician should ...
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Highly Likely
02 - Comfortmaker Central Air Conditioner Wifi Thermostat
The WiFi thermostat has contacts in it that control the furnace. If the contact fails it can result in the furnace and the condensing unit to not run at all.
Common
03 - Comfortmaker Central Air Conditioner Condenser Fan Motor
A faulty condenser fan motor can be responsible for the central air conditioner condensing unit not running. You can use a multimeter to test the fan motor for electrical continuity, a continuous electrical path present in the motor, to help determine if the motor is defective. You can also use the multimeter to determine if power is reaching the motor. You can also try rotating the fan blades by hand. If the blades do not turn freely, it's likely the motor bearings have seized and the fan motor will need to be replaced.
Common
04 - Comfortmaker Central Air Conditioner Fan Motor
A faulty fan motor can be responsible for the central air conditioner condensing unit not running. You can use a multimeter to test the fan motor for electrical continuity, a continuous electrical path present in the motor, to help determine if the motor is defective. You can also use the multimeter to determine if power is reaching the motor. You can also try rotating the fan blades by hand. If the blades do not turn freely, it's likely the motor bearings have seized and the fan motor will need to be replaced.
Common
05 - Sealed system problem
If the condensing unit has power to it, the contactor checks out okay, but the fan and compressor are not running, it is likely that the unit is low on refrigerant which will cause the low limit pressure switch to trip and keep the unit from running. Since diagnosing and repairing a sealed system takes specialized tools and knowledge, a qualified service technician should diagnosis and repair the unit.
Common
06 - Comfortmaker Central Air Conditioner Pressure Switch
A pressure switch is a safety device used to help prevent component and system failures. There are basically three types of pressure switches used in central air conditioning and heat pump applications: High Limit, Low Limit, and Ambient Temperature. Depending on the model, you may have one or more of these or none. The pressure switch(es) can be checked with a multimeter, referencing the wiring diagram for the circuit locations. Note: If a pressure switch needs to be replaced the refrigerant will need to be removed, requiring a qualified technician.
Less Common
Frequently Asked Questions
Why is my Comfortmaker outdoor AC unit not running?
What should I check if my condenser fan is not spinning?
How do I know whether the AC compressor is not running or the condensing unit has another problem?
Can low refrigerant or a pressure switch keep my AC condensing unit from turning on?
How can I find the correct Comfortmaker replacement part for my central air conditioner?
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