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Error code reference

Miele Dishwasher Error Code F25

Target temperature fault

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Target temperature fault — the desired temperature was not reached within the given time (minimum 75 minutes) during the heating stage.

First step from the service manual

Check heater; replace if defective.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F25 means on a Miele dishwasher

The F25 error code on a Miele dishwasher indicates a target temperature fault. During a wash or rinse cycle, the control system monitors how quickly the water reaches the required temperature. If the water does not reach the target temperature within the allotted time window, which has a minimum threshold of 75 minutes, the control board flags the fault and halts the heating stage. This is a time-based safety and performance check designed to prevent extended energy consumption and protect dishes from inadequate sanitization.

The heating circuit is the primary system involved in this fault. The circulation heater is responsible for raising water temperature during the cycle, and any failure in that component will prevent the target temperature from being reached. A failed or degraded heater element will draw insufficient current or no current at all, leaving water at or near inlet temperature regardless of how much time passes. The control board detects this plateau and triggers F25.

Beyond a failed heater, secondary causes can also produce this error. A faulty NTC temperature sensor may report incorrect temperature readings to the control board, causing the board to believe the target has not been reached even when it has. Low water pressure or a partially blocked inlet can result in insufficient water volume, which also affects heating performance. In some cases, a control board fault can disrupt the heating relay circuit, preventing power from reaching the heater at all.

Source: manufacturer service documentation.

Common causes of F25

  1. 01

    Failed heating element

    Part replacement

    The circulation heater is the most likely culprit. A burned-out or degraded element will fail to raise water temperature, triggering F25 after the 75-minute timeout. Testing the heater for continuity or correct resistance will confirm whether it has failed.

  2. 02

    Faulty NTC temperature sensor

    Part replacement

    The NTC sensor measures water temperature and reports it to the control board. If the sensor is out of calibration or has failed, it may send incorrect readings that cause the board to register a temperature shortfall even when the heater is functioning correctly.

  3. 03

    Control board heating relay fault

    Part replacement

    The control board activates the heater through an internal relay. If that relay is stuck open or damaged, power never reaches the heating element and water temperature will not rise, producing the F25 fault.

  4. 04

    Inadequate water fill

    Wiring / connection

    If the dishwasher is not filling to the correct level due to low water pressure or a restricted inlet valve, the reduced water volume can affect heating efficiency and prevent the target temperature from being reached in time.

  5. 05

    Wiring or connector issue in the heating circuit

    Wiring / connection

    Loose, corroded, or damaged wiring between the control board and the heater can interrupt power delivery. Inspecting the harness and connectors at both the heater and the board can identify this problem without replacing major components.

See the test procedure for each cause

Frequently asked questions about F25

What does F25 mean on a Miele dishwasher?
F25 on a Miele dishwasher means the appliance failed to reach the target water temperature within the required time during a heating stage, with a minimum threshold of 75 minutes. The control board monitors temperature rise throughout the cycle and triggers this fault when the water temperature plateaus below the setpoint. The heating element is the first component to inspect. Secondary causes include a faulty NTC temperature sensor, wiring faults, or a control board relay failure.
Can I fix F25 on my Miele dishwasher myself?
Some steps are accessible to a knowledgeable DIYer. You can check the water supply for adequate pressure and inspect wiring connections to the heater for obvious damage or corrosion. Testing and replacing the heating element or NTC sensor requires basic electrical knowledge and a multimeter. If the control board is the source of the fault, professional repair or board replacement is typically the better route.
Is it safe to keep using my Miele dishwasher when F25 is showing?
It is not recommended to continue running cycles with an active F25 fault. If the heating element is not functioning, dishes will not be properly cleaned or sanitized, which is a hygiene concern. The dishwasher may also repeatedly time out and halt mid-cycle. Resolving the underlying fault before running further cycles is the safest approach.
How much does it cost to repair a Miele dishwasher F25 error?
Repair costs vary depending on the failed component and whether you hire a technician. Replacing a heating element yourself typically costs in the range of $50 to $150 for the part alone. An NTC temperature sensor is generally less expensive, often in the $20 to $60 range. Professional labor adds to these figures, and a control board replacement is the most expensive scenario, potentially ranging from $200 to $500 or more including labor.
Will resetting my Miele dishwasher clear the F25 error?
A reset may clear the fault code temporarily and allow the dishwasher to start a new cycle, but if the underlying component has failed, the F25 error will return once the heating stage is reached again. Resetting is useful for ruling out a one-time control glitch, but it does not address a failed heater, sensor, or wiring problem. Persistent F25 errors require proper diagnosis and component repair or replacement.

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