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Air Conditioner Powers On But Won't Run

Troubleshooting Air Conditioners Last Updated 09/19/2017

AIR CONDITIONER POWERS ON BUT WON’T RUN

If your air conditioner powers on but will not run, this is usually the result of an inadequate power supply for the unit.

Turn the circuit breaker to the unit off and back on again. If the breaker is tripping and causing the loss of power, turn off all other electrical devices in the room besides the air conditioner. If the air conditioner runs fine with the other devices turned off, then likely the unit is not on a dedicated circuit breaker.

Note: If your air conditioner is not on a dedicated circuit breaker, the unit may power on but not run. The reason for this is the unit does not require as much power to display the settings, or even run the fan, as it does to turn on and run the compressor. The air conditioner must be on a dedicated circuit breaker not shared with other outlets.

Check the specifications sheet for your particular unit to determine the power requirements. If the air conditioner requires a 208/230 volt power supply, the outlet must be rated to provide the proper power level to the unit. If you only changed the outlet to match the power cord plug but did not have the outlet rewired, then the unit will not be receiving the correct power.

If the air conditioner is set to “ENERGY SAVER” mode, it is possible that the set ambient temperature has been reached. This will cause the display to still show the set temperature, but cooling will not be active. Press the MODE button until COOL is selected, and lower the ambient temperature setting. The air conditioner should cycle on into cool mode.

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