Maytag Dryer Error Code F:22

The F:22 error code on a Maytag dryer indicates that the exhaust thermistor circuit is open. The exhaust thermistor is a temperature-sensing component located in the dryer's exhaust path that continuously monitors outgoing air temperature. It sends resistance-based signals to the control board to regulate heat output and protect the dryer from overheating. An open circuit condition means the control board is receiving no signal from the thermistor, which typically occurs when the thermistor itself has failed, or when there is a break in the wiring between the sensor and the board.

An open thermistor differs from a short in that the circuit has lost continuity entirely rather than reading an incorrect resistance value. This can result from a thermistor that has burned out internally, a connector that has become corroded or physically disconnected, or damaged wiring in the harness leading to the component. Because the control board cannot confirm safe exhaust temperatures without this sensor, the dryer will halt operation and display the fault code to prevent a potential heat-related hazard.

Diagnosing this fault begins with TEST #4a, which is the recommended thermistor diagnostic procedure. This test typically involves checking the resistance across the thermistor terminals and inspecting the wiring harness for breaks or poor connections. Technicians should use a multimeter to confirm whether the thermistor has failed open or whether a wiring fault is responsible before ordering replacement parts.