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HomeRepair HelpBroan Central A/C RepairBroan Central A/C Condensing unit does not run Repair
Broan Central Air Conditioner Condensing unit does not run
If your Broan central air conditioner condensing unit does not run, the most likely cause is a failed compressor, although a faulty wall thermostat can also prevent both the furnace and outdoor unit from starting. A defective condenser fan motor is another common cause, especially if the condenser fan blade will not turn freely or the motor lacks electrical continuity. If the outdoor unit has power, the contactor works, and neither the compressor nor fan runs, the system may have low refrigerant, causing the low pressure switch to trip. A failed pressure switch is less common but can also stop the AC condenser from turning on. Check the thermostat settings and have a qualified technician test line-voltage components, including the compressor, motors, contactor, and wiring. Turn off power at the disconnect box and circuit breaker before inspecting parts, and do not work inside the 240V condensing unit unless qualified. Refrigerant diagnosis, pressure-switch replacement, and any sealed-system repair require EPA 608 certification and a licensed HVAC technician. Enter your Broan model number to find the exact replacement compressor, thermostat, condenser fan motor, fan motor, or pressure switch for your central air conditioner.
01 - Broan 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 - Broan 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 - Broan 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 - Broan 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 - Broan 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 Broan outdoor AC unit not running?
What should I check when the condenser fan is not spinning?
Could a bad compressor cause my AC condensing unit not to start?
Can a pressure switch keep my central air conditioner from turning on?
How do I find the correct Broan replacement part for an AC unit that is not running?
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