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HomeRepair HelpPhilco Central A/C RepairPhilco Central air conditioner compressor won't run Repair
Philco Central air conditioner compressor won't run
When a Philco central air conditioner compressor is not running, the compressor itself may be defective or worn, but it is not usually the first part to replace. An AC compressor not running can also result from a failed start capacitor, a defective contactor, a bad run capacitor, or a failed capacitor or dual run capacitor. The start capacitor helps the compressor start, while the contactor closes the high-voltage circuit when it receives a signal from the control board. Bulging or leaking capacitors and burnt contactor contacts are warning signs, but electrical testing is required for a reliable diagnosis. Because the compressor, capacitors, and contactor involve 240V line voltage, turn off power at the disconnect box and circuit breaker, and leave live-voltage testing or replacement to a qualified HVAC technician if you are not trained to work safely with high voltage. Testing or replacing the compressor involves the sealed refrigerant system and requires an EPA 608-certified technician. Enter your Philco central air conditioner model number to find the exact replacement part for your specific unit.
01 - Philco 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 - Philco 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 - Philco 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 - Philco 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 - Philco 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 - Philco 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 Philco central AC compressor not running?
Why is my AC compressor humming but not starting?
What should I check if my outdoor AC unit is not turning on?
How can I tell whether the compressor is bad or the capacitor is bad?
How do I find the correct Philco AC compressor or capacitor replacement part?
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