Window Air Conditioner: Why are my window air conditioner's evaporator fins iced up?
The evaporator fins on a window air conditioner ice up if the compressor runs constantly for one of these reasons:
A dirty air filter restricts air flow.
The air conditioner is too small for the room.
The temperature setting is too cold.
A control is defective.
See the repairs below to help correct a problem with evaporator finds that ice up.
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.
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.
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.
Replace the window air conditioner evaporator thermistor
The evaporator thermistor is a temperature sensor that is mounted on the evaporator. It monitors the temperature of the evaporator to detect excessive frost on the evaporator. The thermistor communicates that temperature to the electronic control board through a wire harness connection. If the evaporator frosts up, the electronic control board will detect the frost according to the temperature communicated through the thermistor. If the thermistor is defective, the electronic control will not properly detect and eliminate the frost. Replace the evaporator thermistor if it doesn't properly detect the evaporator temperature.
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.
45 minutes or less
May 1, 2014
By Lyle Weischwill
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.
90 minutes or less
The electronic control board is the brain of your window air conditioner. Here’s how to replace it.
45 minutes or less
Use the advice and tips in these articles and videos to get the most out of your window air conditioner.