Maytag Dishwasher Error Code F9

F9 on a Maytag dishwasher indicates a thermistor fault, meaning the control board has detected a bad or out-of-range reading from the Wash Process Sensor. This sensor monitors water temperature during the wash cycle. The dishwasher halts operation to prevent running at incorrect temperatures until the issue is resolved.

It is not recommended to continue using the dishwasher while the F9 code is active. The control board cannot accurately monitor wash temperature without a functioning sensor, which could result in inadequate cleaning or sanitization. Address the fault before running additional cycles.

A reset may temporarily clear the F9 code, but it will return if the underlying cause has not been repaired. The control board will detect the same bad sensor reading the next time a cycle is run. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and fixing the root problem.

In many cases, yes. Start by checking the wiring connections between the Wash Process Sensor and the control board, as a loose or corroded connector is a common and straightforward fix. If connections are secure, the sensor itself may need to be tested and replaced, which is a moderate DIY repair. Control board replacement is more involved and may be better suited for a technician.

Repair costs depend on the failed component. A replacement Wash Process Sensor typically costs between $20 and $60 for the part. Control board replacement is significantly more expensive, often ranging from $100 to $250 or more for the part alone. Adding professional labor will increase the total cost.