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HomeRepair HelpKenmore Central A/C RepairKenmore Central air conditioner compressor won't run Repair
Kenmore Central air conditioner compressor won't run
If your Kenmore central AC compressor is not running, the compressor may be defective, but check the more common starting and power components first. A failed start capacitor is a frequent cause of an air conditioner compressor that won't start, especially if the compressor hums but does not run. Next, inspect the contactor, which sends voltage to the outdoor condensing unit, followed by the run capacitor, capacitor, and dual run capacitor. A bulging, leaking, or failed capacitor can keep the compressor from operating. If these parts test correctly, use a multimeter to check the compressor for continuity. An open circuit indicates that the compressor may be defective. Replacing a compressor or working on the sealed system involves refrigerant and requires EPA 608 certification, so have a licensed HVAC technician handle that repair. Testing or replacing a contactor, capacitor, or other 240-volt component also presents serious shock risk and is beyond basic DIY work unless you are qualified to work safely with line voltage. Enter your Kenmore central air conditioner's model number to find the exact replacement compressor, start capacitor, run capacitor, dual run capacitor, or contactor for your specific unit.
01 - Kenmore 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 - Kenmore 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 - Kenmore 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 - Kenmore 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 - Kenmore 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 - Kenmore 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 won't my Kenmore AC compressor run?
How do I test an AC capacitor when the compressor won't start?
How can I tell if the AC contactor is stopping the compressor from running?
How do I know whether the compressor itself is defective?
How do I find the correct Kenmore AC compressor or capacitor replacement part?
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