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HomeRepair HelpNutone Central A/C RepairNutone Central A/C Condensing unit does not run Repair
Nutone Central Air Conditioner Condensing unit does not run
If your NuTone central air conditioner condensing unit does not run, the compressor is the first component to consider, followed by the wall thermostat, condenser fan motor, fan motor, a sealed system problem, and the pressure switch. A failed compressor can stop the outdoor unit even when the furnace or air handler blower works. A faulty thermostat contact can prevent both the furnace and condensing unit from starting, while a seized condenser fan motor can keep the outdoor AC unit from running. With power disconnected, you can check whether the fan blade turns freely and use a multimeter for continuity, but testing 240V wiring, the contactor, or other energized components is beyond basic DIY work. If the compressor and fan are both off while the unit has power, low refrigerant may have tripped the low pressure switch. Refrigerant diagnosis, pressure-switch replacement, and any repair inside the sealed system require EPA 608 certification and a qualified HVAC technician. Enter your NuTone model number to find the exact replacement thermostat, condenser fan motor, fan motor, compressor, or pressure switch for your central air conditioner.
01 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 NuTone AC condenser not turning on?
What should I check when my condenser fan is not running?
Can a thermostat cause the outdoor AC unit not to turn on?
Why do the compressor and condenser fan both stop running?
How do I find the correct NuTone AC replacement part?
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