Miele Dishwasher Error Code F4

F4 means the dishwasher's electronic control detected a water temperature above 194°F (90°C) via the NTC temperature sensor and shut the appliance off as a protective measure. This can result from a genuinely overheating heating circuit or from a faulty sensor reporting incorrect high temperatures. The appliance will not operate again until the fault is resolved. Both the NTC sensor and the heating circuit components including temperature limiters should be inspected.

No. The dishwasher shuts itself down when F4 is triggered specifically because operating with temperatures above 194°F poses a safety risk and can damage the appliance and its contents. Do not attempt to bypass the error or force the machine to run. The fault should be diagnosed and corrected before resuming normal use.

Repair costs vary depending on which component has failed. Replacing an NTC temperature sensor or temperature limiter is generally on the lower end of the cost range, typically somewhere between $75 and $200 including parts and labor. A faulty control board with a failed relay is a more expensive repair, often ranging from $250 to $500 or more depending on the model and labor rates in your area. Getting a diagnostic assessment from a Miele-authorized technician before committing to parts is recommended.

Some aspects of diagnosing F4 are accessible to knowledgeable DIYers, such as visually inspecting wiring connections and testing NTC sensor resistance with a multimeter. However, work involving the heating element, temperature limiters, or control board typically requires disassembly of internal panels and carries electrical risk if the appliance is not fully disconnected from power. If you are not comfortable working with appliance electrical components, a qualified technician is the safer option.

A power reset may clear the F4 code temporarily, allowing the dishwasher to start a new cycle. However, if the underlying fault in the NTC sensor, heating element, temperature limiter, or wiring has not been corrected, the error will return, often during the same or the next wash cycle. Clearing the code without repairing the root cause is not a solution.