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HomeRepair HelpMedallion Central A/C RepairMedallion Central air conditioner compressor won't run Repair
Medallion Central air conditioner compressor won't run
When your Medallion central air conditioner compressor won't run, the cause may be the compressor itself, but several electrical parts are more commonly responsible. An AC compressor not running can result from a failed start capacitor, followed by a defective contactor that does not send power to the condensing unit. Less common causes include a failed run capacitor, capacitor, or dual run capacitor, which may prevent the compressor from starting or operating. Before replacing the compressor, inspect for bulging or leaking capacitors and have the compressor tested for continuity with a multimeter. Because the compressor, capacitors, and contactor involve dangerous 240V line voltage, shut 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 for this work. A compressor or any repair inside the sealed refrigerant system also requires an EPA 608-certified technician. Enter your Medallion central air conditioner model number to find the exact replacement compressor, start capacitor, contactor, run capacitor, or dual run capacitor for your unit.
01 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 Medallion central AC compressor not running?
What should I check when my AC compressor won't start?
Can a bad capacitor make my central AC compressor not run?
Why is my AC condensing unit not turning on even though the thermostat is calling for cooling?
How do I find the correct Medallion central air conditioner compressor or capacitor part?
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