Filter for air

Lack of adequate air flow is the most common cause of Window AC not working. Air is drawn over the evaporator coils in a working air conditioner, cooled, and then recirculated back into the room by a fan. There may be little or no air flow over the evaporator coils if the air filter is dirty or clogged, causing them to become too cold and frost or ice to form, further restricting the airflow. As a result, little or no cool air will circulate in the room. In most cases, the air filter is located behind the front grille, which may have a side opening for access. Filters should be cleaned or replaced on a regular basis. We recommend cleaning the evaporator coils with soapy water and a soft brush if they are very dirty, as well as replacing the filter.

The fan motor and the fan

It is possible that the fan or fan motor is malfunctioning if your Window AC not working. The fan of a properly functioning air conditioner will draw air over the cold evaporator coils and recirculate it back into the room. Little or no air flow over the evaporator coils will allow them to become too cold and frost or ice can form, restricting further air flow if the circulating fan is not running or running too slowly. Performing any checks will require removing the cabinet since the fan and motor are located inside. Make sure the fan motor turns easily and that the blades are not damaged. Motors and fan blades must be replaced if they are seized or damaged. It may still be defective or the motor may not be receiving power from the controls if it turns easily. Performing these tests requires a qualified person who is comfortable using a multimeter.

Controlling the temperature

You may have a problem with your temperature control or thermostat if your air conditioner does not blow cold air after you check the air filter and fan motor. This device controls the compressor by monitoring the incoming air temperature. A sensing bulb is usually attached to the control, and a set of electrical contacts are located in the body of the control that supply power to the compressor. When the set temperature is lower than the room temperature, the bulb will signal the thermostat control to turn on the compressor. Upon reaching the desired temperature, the thermostat will also turn off the compressor. It may not send power to the compressor if the temperature control or thermostat is defective. Check the sensing bulb for sharp bends, kinks, or ruptures and replace the control if necessary. Alternatively, you can use a multi-meter to check continuity by rotating the dial all the way down. Before condemning the control, check that the sensing bulb is properly positioned in the air flow through the evaporator coils.