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Error code reference

Miele Dishwasher Error Code F02

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

Miele codesMiele dishwasher codes

Water/heating NTC temperature sensor R30 or its connection leads are open-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 F02 means on a Miele dishwasher

The F02 error code on a Miele dishwasher indicates an open-circuit fault in the water and heating NTC (Negative Temperature Coefficient) temperature sensor, designated R30, or in the wiring leads connected to it. An NTC sensor works by decreasing its electrical resistance as temperature rises. When the control board detects an open circuit rather than the expected resistance value, it interprets this as a failed or disconnected sensor and triggers the F02 fault. Because the machine can no longer reliably monitor water temperature, the heating element is disabled as a safety measure, and the rinse aid dispenser is also locked out.

The sensor R30 has specific resistance targets that technicians can use to confirm its condition: at 68°F the resistance should read approximately 14.9 kilohms with a tolerance of plus or minus 750 ohms, and at 77°F it should read approximately 12 kilohms with a tolerance of plus or minus 600 ohms. A reading that is infinite or open on a multimeter confirms the sensor element itself has failed internally. A reading that fluctuates erratically points toward a broken wire or corroded connector rather than sensor failure.

Common causes include physical damage to the sensor from prolonged heat exposure, corrosion at the wiring harness connectors due to moisture inside the tub area, and hairline fractures in the sensor leads caused by repeated thermal cycling. Because the dishwasher will not heat water or dispense rinse aid when this fault is active, the machine is effectively unable to complete a proper wash cycle until the fault is resolved and the sensor circuit is restored to its correct resistance range.

Source: manufacturer service documentation.

Common causes of F02

  1. 01

    Failed NTC temperature sensor R30

    Part replacement

    The sensor element itself has burned out or cracked internally, causing an open circuit. A multimeter placed across the sensor terminals will show infinite resistance rather than the expected 12 to 14.9 kilohm range.

  2. 02

    Corroded or disconnected wiring connector

    Wiring / connection

    Moisture inside the dishwasher can corrode the connector pins on the sensor harness, breaking continuity without physically damaging the sensor. Inspect the connector for green or white corrosion deposits and confirm each pin seats firmly.

  3. 03

    Broken or pinched sensor lead wire

    Wiring / connection

    The thin lead wires running from the sensor can develop hairline fractures from repeated heating and cooling cycles, or can be pinched during a previous repair. A continuity test on each individual wire will identify a broken conductor.

  4. 04

    Damaged wiring harness between sensor and control board

    Part replacement

    If the harness section farther from the sensor is chafed or damaged, the open circuit will appear even though the sensor itself tests within spec. Trace the full length of the harness and look for any sections where insulation has worn through.

See the test procedure for each cause

Frequently asked questions about F02

What does F02 mean on a Miele dishwasher?
F02 indicates that the water and heating NTC temperature sensor R30, or its connecting wires, has an open circuit. Because the control board cannot read a valid temperature signal, the machine disables the heating element and blocks rinse aid dispensing. The fault must be resolved before the dishwasher can complete a normal wash cycle.
Can I fix the F02 error myself?
A knowledgeable DIYer can begin by checking the sensor connector for corrosion and reseating it, which sometimes clears the fault. Confirming the sensor's resistance with a multimeter at 68°F (target: approximately 14.9 kilohms) or 77°F (target: approximately 12 kilohms) will tell you whether the sensor needs replacement. If the wiring or the sensor itself has failed, replacing those components requires basic electrical skills and correct part sourcing, so many homeowners prefer to call a technician at that stage.
Is it safe to keep using my dishwasher with an F02 error?
Running the dishwasher with an active F02 fault means the water will not be heated and rinse aid will not be dispensed, so dishes will not be properly cleaned or sanitized. While the fault itself is not a fire or flood hazard, continuing to run cycles in this state will produce poor results and will not resolve the underlying problem. It is best to address the fault before using the machine further.
How much does it cost to repair the F02 error on a Miele dishwasher?
If only the connector needs cleaning and reseating, there may be no parts cost at all, though a service call will typically run between $80 and $150 depending on your area. Replacing the NTC temperature sensor R30 usually adds a parts cost in the range of $20 to $80 for the sensor itself. If the wiring harness needs repair or replacement, total repair costs including labor can range from $150 to $350 or more.
Will resetting the dishwasher clear the F02 error code?
A power reset may temporarily clear the displayed code, but F02 will return as soon as the control board attempts to read the sensor again and detects the open circuit. The only way to permanently clear this fault is to repair or replace the defective sensor or wiring so the circuit reads within the correct resistance range. Do not rely on repeated resets as a workaround.

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