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HomeRepair HelpColeman Central A/C RepairColeman Central A/C Condensing unit does not run Repair
Coleman Central Air Conditioner Condensing unit does not run
When your Coleman central air conditioner condensing unit does not run, the outdoor AC unit may not be turning on even though the indoor blower operates. The most likely cause is a failed compressor, followed by a faulty wall thermostat, condenser fan motor, or fan motor. A compressor, condenser fan motor, and fan motor can be checked for electrical continuity with a multimeter, and the condenser fan blades should rotate freely by hand with power disconnected. If the AC condenser is not turning on and both the fan and compressor remain off, a sealed-system problem, such as low refrigerant causing the low pressure switch to trip, may be responsible. A defective pressure switch is less common but can also keep the condensing unit from starting. Testing or replacing parts inside the outdoor unit involves 240V line voltage, so shut off power at the disconnect box and circuit breaker, and only proceed if you are qualified. Refrigerant diagnosis, sealed-system repairs, and pressure-switch replacement require EPA 608 certification and a licensed HVAC technician. Enter your Coleman model number to find the exact replacement compressor, thermostat, condenser fan motor, fan motor, or pressure switch for your central air conditioner.
01 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 Coleman central air conditioner not turning on?
How do I troubleshoot a condenser fan that is not spinning?
What should I check before replacing an AC compressor that will not run?
Can low refrigerant cause my AC condensing unit not to run?
How do I find the correct replacement part for my Coleman central air conditioner?
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