This DIY repair guide explains how to replace the ambient thermistor in a window air conditioner. The ambient thermistor is a sensor that detects the room air temperature so the electronic control board can regulate the room temperature. If the thermistor isn't working, the air conditioner won't maintain the temperature you set. Replace a malfunctioning ambient thermistor with the manufacturer-approved window air conditioner part.
Use this procedure to replace the ambient thermistor in Kenmore, Frigidaire, Crosley, GE, Haier and LG window air conditioners.