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HomeRepair HelpYork Central A/C RepairYork Central air conditioner compressor won't run Repair
York Central air conditioner compressor won't run
When your York central air conditioner compressor won't run, the system may not cool even though the blower operates. The most likely cause is a failed compressor, although the compressor is not usually the first part to replace. An open continuity reading can indicate a defective compressor. Next, check the start capacitor, which helps the compressor begin its cycle. A failed contactor can also stop the compressor by preventing voltage from reaching the condensing unit. Less common causes include a defective run capacitor, capacitor, or dual run capacitor. These parts may be bulging, leaking, or unable to hold and release a charge. This guidance applies when an AC compressor is not running, an air conditioner compressor won't start, or a central AC compressor is not working. Turn off power at the disconnect box and circuit breaker before inspecting components, and remember that capacitors and contactors can hold dangerous electrical charges. Testing or replacing parts in the 240V condensing unit should be done only if you are qualified; compressor or other sealed-system repairs involving refrigerant require an EPA 608-certified or licensed HVAC technician. Enter your York model number to find the exact replacement part for your specific central air conditioner.
01 - York 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 - York 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 - York 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 - York 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 - York 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 - York 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 York central AC compressor not running?
How do I test a central AC start or run capacitor?
How can I tell if the AC contactor is stopping the compressor from running?
What should I check before replacing a York AC compressor?
How do I find the correct York central AC compressor or capacitor part?
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