DIY Air Conditioning Service Repair Overview: Central home air conditioner service failures and solutions. The dual run capacitor was bad causing the fan motor to buzz. If all else fails, check to see if there is a problem with your air conditioner… In addition, the reason why the external fan of the air conditioner does not rotate is that the external unit of the air conditioner is located outdoors. It is a magnetized switch that turns on and off with signals sent by the thermostat. Air conditioner not working and indoor fan constantly runs. After a long time of use, the radiator will absorb a lot of dust, garbage and other dirt. Just a quick video on how to fix your home air conditioner. I don’t have any experience with AC units. What is the reason why the fan of air conditioner doesn't work. My outdoor unit is not running when trying to cool or heat. Also, the indoor fan that circulates air throughout the house is constantly running, even with the fan set to “auto” and the thermostat set to “off”. Fan Is Not Working in a Window Air Conditioner Unit. How to fix your ac outdoor fan not running you air conditioner fan not working you problems that plague a central air conditioning system edutrek why is my outdoor ac unit s fan not spinning a phoenix tech. If your window air conditioner won’t turn on, it may be that it is not getting any power. Inside the condenser is the primary motor control. After an extended period of time, you fan can break or stop working. Air Conditioner Fan Not Working Because of the Primary Motor Control. When your window air conditioner fan is not working, you might be tempted to just buy a new one. 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