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HomeRepair HelpHeil Central A/C RepairHeil Central A/C Condensing unit does not run Repair
Heil Central Air Conditioner Condensing unit does not run
If your Heil central air conditioner's condensing unit won't start, the outdoor AC unit not running is usually caused by a failed compressor, wall thermostat, condenser fan motor, or fan motor. A compressor that has lost electrical continuity can keep the AC condenser from turning on, although the compressor is less common than control or motor problems. A faulty wall thermostat may fail to send the signal that starts the furnace and condensing unit. Check whether the condenser fan spins freely by hand with power disconnected, since seized bearings can indicate a failed condenser fan motor. If the unit has power and the contactor operates, but neither the compressor nor fan runs, low refrigerant may have tripped the low pressure switch, indicating a sealed-system problem. A defective pressure switch can also prevent the condensing unit from running. Testing capacitors, motors, thermostats, and wiring may involve 240-volt line voltage, so shut off power at the disconnect box and circuit breaker, and call a qualified technician for live-voltage testing. Any refrigerant or sealed-system repair requires EPA 608 certification. Enter your Heil model number to find the exact replacement part for your central air conditioner.
01 - Heil 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 - Heil 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 - Heil 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 - Heil 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 - Heil 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 Heil AC condenser not turning on?
How do I troubleshoot a Heil condenser fan that is not running?
Could a thermostat or pressure switch keep my Heil air conditioner from starting?
How can I tell whether the Heil AC compressor is bad?
How do I find the correct Heil AC replacement part?
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