Miele Dishwasher Error Code F1

F1 on a Miele dishwasher indicates that the NTC temperature sensor circuit is open, meaning the control board cannot receive a valid temperature signal. The dishwasher halts operation because it cannot safely monitor or regulate water heating without that input. The fault points to either a failed thermistor sensor, broken wiring leads, or a faulty connector in the sensor circuit.

No, it is not recommended to continue running the dishwasher while the F1 fault is active. Without a functioning temperature sensor, the machine cannot properly control the heating element, which could result in inadequate cleaning, undissolved detergent, or a potential overheating condition. The dishwasher is designed to stop operation and display the fault for this reason.

A reset may temporarily clear the fault display, but if the underlying open circuit condition still exists, F1 will return as soon as the dishwasher attempts to read the temperature sensor again. Resetting does not repair a broken wire, failed sensor, or corroded connector. The fault must be diagnosed and the root cause corrected for the error to clear permanently.

A knowledgeable DIYer can address this fault by inspecting the sensor wiring and connectors for visible damage, corrosion, or loose connections, and by testing the NTC sensor's resistance with a multimeter. If the sensor reads open circuit (infinite resistance), replacing the sensor is a straightforward repair. Wiring repairs and connector cleaning are also within reach for someone comfortable working with low-voltage appliance circuits. Control board replacement is more complex and may warrant a professional technician.

If the repair only requires cleaning a connector or addressing a wiring issue, costs may be minimal, primarily your time or a basic service call fee. Replacing the NTC temperature sensor typically involves parts costs in the range of $20 to $80 depending on the specific model. If the control board is at fault, parts and labor combined can range from $150 to $400 or more. Getting a diagnostic assessment first helps avoid unnecessary parts replacement.