Miele Dishwasher Error Code F02

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.

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.

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.

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.

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.