The F22 error code on a Whirlpool Duet Dryer indicates that the exhaust thermistor is open. The thermistor is a crucial component in the dryer, responsible for monitoring the exhaust temperature. The dryer’s control system relies on the thermistor to accurately measure and maintain the proper temperature by cycling the heater relay on and off. When the thermistor is open, the dryer cannot accurately control the temperature, which can prevent it from operating correctly.

When the F22 error code flashes on the display, it means the thermistor is not sending the correct signals to the machine control electronics. This usually happens when the thermistor or its wire harness has an open circuit. In simpler terms, there is a break in the electrical path, causing the dryer to shut down to prevent further issues. The F22 error specifically indicates that the thermistor is not registering any continuity, which is essential for its operation.

To diagnose the F22 error, the dryer must be placed in a diagnostic test mode, where the machine will attempt to run a cycle while monitoring the thermistor's readings. If the error appears during this test, it confirms that the thermistor or its connections are faulty and need to be checked or replaced.

It is crucial to address the F22 error promptly, as ignoring it could lead to further damage to the dryer or inefficient drying performance. A faulty thermistor can cause the dryer to either overheat or not heat at all, which can be hazardous and affect the longevity of the appliance.

For a detailed guide on troubleshooting and repairing the F22 error code, please refer to our repair guide linked below. This guide provides step-by-step instructions on how to test the thermistor, check wire connections, and replace the thermistor if necessary.