Window Air Conditioner: Why won't my window air conditioner start?
If you know the the window air conditioner has electrical power because the control panel powers up, but the compressor and fans won't run, possible causes include an electronic control failure or a wiring problem.
he window air conditioner also won't start if the electronic control detects a component problem such as a defective thermistor. Check the control panel for an error code, which usually indicates which component failed. To decipher an error code, check our error code tables or refer to your owner's manual. Some repairs that could correct the problem are listed below.
THESE REPAIRS MAY HELP SOLVE YOUR WINDOW AIR CONDITIONER PROBLEM
Replace the window air conditioner control thermostat
Some window air conditioners have an electro-mechanical thermostat instead of an electronic control board to control the on/off cycling of the compressor and fans. Replace the thermostat if it fails to control the compressor and fans properly.
Window air conditioner control thermostat
Replace the window air conditioner electronic control board
The electronic control board regulates the compressor, evaporator fan and condenser fan in the window air conditioner. If the electronic control board doesn't activate those components properly, replace the control board.
Window air conditioner electronic control board
When a window air conditioner won't cool or won't start at all, the electronic control board might be the problem. This step-by-step repair guide shows how to replace a window air conditioner electronic control board.
Replace the window air conditioner user interface control board
The user interface control board in the control panel houses the selection buttons you push. A wire harness connects the user interface control board to the control board. If the selection buttons don't respond when you push them, replace the user interface control board.
Window air conditioner user interface control board
If the buttons on your window air conditioner don't work or if the control panel doesn't light up, the user interface control board could be the problem. This DIY repair guide explains how to replace a window air conditioner user interface control board in less than 30 minutes.
Replace the window air conditioner ambient thermistor
The window air conditioner ambient thermistor-also known as a temperature sensor-senses the temperature of the air entering the air conditioner and communicates that temperature to the electronic control board, which cycles the compressor on and off to maintain the set room temperature. The ambient thermistor is attached to the evaporator coil that's behind the air filter, and a wire harness connects the ambient thermistor to the electronic control board. If the ambient thermistor is defective, the electronic control board will not cycle the compressor on and off properly to maintain the room temperature that is set on the control. Replace the ambient thermistor if it doesn't accurately measure the ambient room temperature.
Window air conditioner ambient thermistor
If your window air conditioner isn't cooling the room very well, the ambient thermistor might be at fault. This DIY repair guide explains how to replace a window air conditioner ambient thermistor with step-by-step instructions.
These step-by-step repair guides will help you safely fix what’s broken on your window air conditioner.
If your window air conditioner isn’t cooling properly, it might need a new ambient thermistor. You can replace it yourself following these instructions.
If the condenser fan blade is broken or the condenser fan motor won’t run, you can replace the broken parts yourself by following these instructions.
The electronic control board is the brain of your window air conditioner. Here’s how to replace it.
Use the advice and tips in these articles and videos to get the most out of your window air conditioner.
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