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HomeRepair HelpComfortmaker Central A/C RepairComfortmaker Central air conditioner compressor won't run Repair
Comfortmaker Central air conditioner compressor won't run
If your Comfortmaker central AC compressor is not running, the compressor itself may be defective or worn out, but it is not usually the first part to replace. An air conditioner compressor that won't start can also be caused by a failed start capacitor, defective contactor, run capacitor, capacitor, or dual run capacitor. The start capacitor helps cycle on the compressor, while the contactor closes the high-voltage circuit to the condensing unit. A run capacitor or dual run capacitor supplies operating power to the compressor and condenser fan motor. Look for a bulging or leaking capacitor, or use a multimeter to test capacitors and the compressor for continuity, but turn off power at the disconnect box and circuit breaker first. Central AC components use dangerous 240-volt electricity, so testing or replacing the contactor, capacitors, or compressor is beyond basic DIY scope unless you are qualified to work safely around line voltage. Compressor replacement involves opening the sealed refrigerant system and requires EPA 608 certification and a licensed HVAC technician. Enter your Comfortmaker model number to find the exact replacement part for your specific central air conditioner.
01 - Comfortmaker Central Air Conditioner Compressor
The compressor is a pump which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. If the compressor is defective or worn out, it likely won't run. However, this isn’t usually the case. Before replacing the compressor, first check all of the more commonly defective components. If all of the other components are working properly, use a multimeter to test the compressor for continuity. If there is an open circuit, the compressor is likely defective.
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Highly Likely
02 - Comfortmaker Central Air Conditioner Start Capacitor
A start capacitor is often used to cycle on the compressor. If the capacitor burns out, the compressor may not run. The start capacitor can be tested with a multimeter to determine if the component can successfully hold and release its charge. If the capacitor is unable to hold and release a charge, or is bulging or leaking, the capacitor will need to be replaced.
Common
03 - Comfortmaker Central Air Conditioner Contactor
The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it can prevent the compressor from running. To determine if the contactor is at fault, use a multimeter to test the contactor coil for continuity. If the contactor coil does not have continuity or the contacts a on the coil look burnt, replace it.
Common
04 - Comfortmaker Central Air Conditioner Run Capacitor
A run capacitor will power either the compressor or the fan motor (a dual run capacitor will power both). If the capacitor burns out, the compressor may not run. To determine if the run capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
05 - Comfortmaker Central Air Conditioner Capacitor
The capacitor provides voltage to the compressor to start it. If the capacitor is defective, the compressor won't run. To determine if the capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
06 - Comfortmaker Central Air Conditioner Dual Run Capacitor
A dual run capacitor will power both the compressor and the fan motor. If the capacitor burns out, the compressor may not run. To determine if the dual run capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Less Common
Frequently Asked Questions
Why is my Comfortmaker central AC compressor not running?
How do I test a central AC start or run capacitor when the compressor won't start?
Could a bad contactor keep my Comfortmaker AC compressor from running?
Should I replace the compressor if my central AC compressor is not running?
How do I find the correct Comfortmaker central AC replacement part?
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