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HomeRepair HelpRheem Central A/C RepairRheem Central air conditioner compressor won't run Repair
Rheem Central air conditioner compressor won't run
When your Rheem central air conditioner compressor won't run, the system may blow warm air or fail to cool even though the indoor blower operates. The compressor itself is a possible cause, but it is not usually the first part to replace. A failed start capacitor is a common reason an air conditioner compressor won't start, followed by a defective contactor that fails to send power to the outdoor condensing unit. Less common causes include a failed run capacitor, capacitor, or dual run capacitor. A qualified technician can test the compressor for continuity and inspect capacitors for bulging, leaking, or an inability to hold a charge. Testing or replacing parts in the outdoor unit involves dangerous 240-volt electricity, so turn off power at the disconnect box and circuit breaker, and leave live-voltage testing to a qualified HVAC professional. Any repair involving refrigerant, the refrigerant lines, or the sealed system requires EPA 608 certification. Enter your Rheem central air conditioner model number to find the exact replacement compressor, start capacitor, contactor, or other part for your specific unit.
01 - Rheem 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 - Rheem 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 - Rheem 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 - Rheem 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 - Rheem 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 - Rheem 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 Rheem central AC compressor not running?
Could a bad capacitor keep my AC compressor from starting?
How do I know if the Rheem AC contactor is preventing the compressor from running?
What should I check if my central AC won't turn on but the indoor blower runs?
How do I find the correct Rheem AC compressor or capacitor replacement part?
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