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Error code reference

Miele Dishwasher Error Code F01

Water/heating NTC temperature sensor R30 or its connection leads are short-circuited; heating will not…

Miele codesMiele dishwasher codes

Water/heating NTC temperature sensor R30 or its connection leads are short-circuited; heating will not activate and rinse aid will not be dispensed.

First step from the service manual

Check the temperature sensor and its leads for continuity. At 68°F the resistance should be approximately 14.9kΩ (±750Ω); at 77°F approximately 12kΩ (±600Ω).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F01 means on a Miele dishwasher

The F01 error code on a Miele dishwasher indicates a short-circuit condition in the water and heating NTC (Negative Temperature Coefficient) temperature sensor, designated R30, or in the wiring leads connected to it. The NTC sensor is a thermistor whose electrical resistance drops predictably as temperature rises. When the control board detects a resistance value that falls outside the expected range due to a short circuit, it interprets this as an invalid temperature reading and triggers F01. Because the sensor's signal is essential for controlling the heating element, the dishwasher's heating circuit is disabled entirely when this fault is active.

A correctly functioning R30 sensor reads approximately 14.9 kilohms (plus or minus 750 ohms) at 68 degrees Fahrenheit, and approximately 12 kilohms (plus or minus 600 ohms) at 77 degrees Fahrenheit. A short circuit drives the resistance far below these values, which the control electronics interpret as an implausibly high water temperature. As a direct consequence, not only is heating suppressed, but rinse aid dispensing is also disabled, since the dispenser's activation is tied to temperature thresholds reached during the wash and rinse cycles.

Common root causes include damaged insulation on the sensor leads creating a short to ground, moisture ingress into the wiring harness connectors, a failed sensor with internal short circuit, or physical damage to the sensor body from overheating or mechanical stress. Diagnosing this fault requires an ohmmeter to check continuity and resistance of the sensor and its leads, comparing measured values against the known specifications to distinguish a sensor failure from a wiring fault.

Source: manufacturer service documentation.

Common causes of F01

  1. 01

    Short-circuited NTC sensor (R30) wiring leads

    Part replacement

    The insulation on the sensor's connection leads can wear, crack, or become pinched, allowing bare conductors to contact each other or the chassis and create a short circuit. Inspect the full length of the wiring harness from the sensor to the control board for visible damage or chafing.

  2. 02

    Failed NTC temperature sensor with internal short

    Part replacement

    The thermistor element inside the R30 sensor can fail internally, producing a resistance value far below the expected range of approximately 12 to 14.9 kilohms at room temperature. Measuring resistance directly across the sensor terminals with an ohmmeter will confirm this if the reading is near zero or significantly below specification.

  3. 03

    Moisture or corrosion in wiring harness connectors

    Wiring / connection

    Water intrusion into the connector plugs joining the sensor leads to the main wiring harness can cause corrosion or conductive bridging between terminals. Inspect all connectors along the sensor circuit for signs of oxidation, greenish deposits, or water residue.

  4. 04

    Damaged sensor body from overheating or mechanical stress

    Part replacement

    Physical damage to the sensor housing, such as cracking from prolonged exposure to high temperatures or impact during servicing, can compromise the sensor internally. Visible cracks or deformation of the sensor body are indicators that replacement is required.

  5. 05

    Loose or corroded connector at the control board

    Wiring / connection

    A poor connection at the control board terminal for the R30 sensor circuit can cause intermittent or incorrect resistance readings. Reseating the connector and cleaning the terminals may resolve the fault if no other wiring or sensor damage is found.

See the test procedure for each cause

Frequently asked questions about F01

What does F01 mean on a Miele dishwasher?
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.
Can I fix F01 on my Miele dishwasher myself?
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.
Will resetting my Miele dishwasher clear the F01 error?
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.
Is it safe to use my Miele dishwasher while F01 is showing?
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.
How much does it cost to repair a Miele dishwasher F01 error?
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.

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