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HomeRepair HelpYork Central A/C RepairYork Central A/C Condensing unit does not run Repair
York Central Air Conditioner Condensing unit does not run
When your York central air conditioner's condensing unit does not run, the AC condenser may not be turning on because of a failed compressor, faulty wall thermostat, defective condenser fan motor, or failed fan motor. A compressor problem is less common, but it can stop the entire outdoor AC unit from running. A thermostat with failed contacts may prevent both the furnace and condensing unit from starting. If the condenser fan is not spinning, check whether the fan blade turns freely and whether the condenser fan motor has electrical continuity. A seized motor may need replacement. 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 responsible. A high or low pressure switch can also fail, although this is less common. Testing electrical parts with a multimeter and working inside the disconnect box involves 240V line voltage, so use a qualified technician if you are not trained. Refrigerant diagnosis, pressure-switch replacement, and any repair inside the sealed system require an EPA 608-certified HVAC technician. Enter your model number to find the exact York replacement part for your central air conditioner.
01 - York 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 - York 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 - York 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 - York 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 - York 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 York outdoor AC unit not running?
What should I check if my condenser fan is not running?
How do I know if the AC compressor is not running?
Can a thermostat cause the York condensing unit not to turn on?
How do I find the correct York AC replacement part?
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