Miele Dishwasher Error Code F01

F01 indicates that the water and heating NTC temperature sensor R30, or its connection leads, has a short circuit. The control board cannot receive a valid temperature reading, so it disables the heating element and the rinse aid dispenser as a protective measure. The fault must be diagnosed by checking the sensor and wiring resistance before the dishwasher will operate normally again.

A power reset may temporarily clear the displayed fault code, but F01 will return as soon as the control board reads the short-circuited sensor again during the next cycle. The underlying wiring or sensor fault must be repaired for the error to stay cleared permanently. Running cycles with this fault active is not recommended because heating is disabled.

If only the sensor wiring needs cleaning or reseating, the repair may cost nothing beyond your time. Replacing the R30 NTC temperature sensor itself typically involves a parts cost in the range of $20 to $80 depending on the specific Miele model. If a technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250.

A knowledgeable DIYer comfortable with basic electrical testing can diagnose this fault using a multimeter. The sensor resistance should read approximately 14.9 kilohms at 68 degrees Fahrenheit or approximately 12 kilohms at 77 degrees Fahrenheit. If the sensor or its wiring tests outside these ranges, replacing the component is straightforward, though accessing the sensor may require partially disassembling the dishwasher's interior base or door assembly depending on the model.

The dishwasher will generally not heat the water or dispense rinse aid while F01 is active, so dishes will not be cleaned or sanitized effectively. There is no immediate safety hazard from continuing to run cycles, but the wash results will be poor and the underlying fault should be addressed promptly to restore proper operation.