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HomeRepair HelpMedallion Central A/C RepairMedallion Central A/C Condensing unit does not run Repair
Medallion Central Air Conditioner Condensing unit does not run
If your Medallion central air conditioner's condensing unit won't start, A bad run capacitor or a tripped circuit breaker or blown fuse is the most likely cause. A failed compressor is a possible but less common cause. A defective wall thermostat is another common reason the AC condenser is not turning on because its contacts control the furnace and outdoor unit. Next, check the condenser fan motor and fan motor. If either motor has no electrical continuity, lacks power, or the fan blades do not turn freely by hand, seized bearings may have stopped the outdoor AC unit. If the condensing unit has power but the contactor, fan, and compressor do not run, low refrigerant may have tripped the low pressure switch, indicating a sealed system problem. A faulty high or low pressure switch is less common. Testing capacitors, motors, the contactor, thermostat, and wiring involves 240V line voltage, so use caution and hire a qualified technician for energized testing or unsafe electrical work. Refrigerant and pressure-switch repairs require EPA 608 certification and a licensed HVAC technician. Enter your model number to find the exact replacement part for your Medallion central air conditioner.
01 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 Medallion AC condenser not turning on?
What should I check if the condenser fan is not spinning?
Can a thermostat cause the outside AC unit not to run?
Could low refrigerant or a pressure switch keep my AC condensing unit from starting?
How do I find the correct Medallion AC replacement part?
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