Miele Washer Error Code F04 — Heating System Fault / Water Not Reaching Temperature
What this means
The F04 error code on Miele washers indicates the heating system is not raising the water temperature as expected. The control board monitors water temperature during heated cycles and expects it to rise at a certain rate. A failed heating element, a blown thermal fuse, a faulty temperature sensor, or a control board relay failure can cause this code.
Alternate codes: F 04
Step-by-step fix
4 stepsReset the washer
Unplug the washer for 5 minutes and plug it back in. Run a hot water cycle. If the water heats normally and no error appears, it was a temporary glitch.
If the washer is connected to a cold-water-only supply and relies entirely on its internal heater, this error will appear if the heater fails.
Test the heating element
Unplug the washer. Access the heating element (usually at the bottom rear of the outer tub). Disconnect its wires and test resistance with a multimeter. A working Miele washer heater typically reads between 20 and 30 ohms. An open line (OL) means the element is burned out.
Also check for continuity between each heater terminal and the metal housing. Any continuity indicates a ground fault.
Test the temperature sensor
Locate the NTC temperature sensor, usually mounted in or near the heating element housing. Disconnect and test with a multimeter. At room temperature, it should read approximately 10,000 to 15,000 ohms. A reading of 0 or OL indicates failure.
If the sensor reads correctly at room temperature, the heating element is the more likely culprit.
Replace the failed component
Replace the heating element if it tests open, or the temperature sensor if it tests out of range. Reassemble and run a hot cycle to verify the water heats properly.
When replacing the heating element, clean any limescale deposits from the element housing before installing the new one.
When to call a professional
If both the heater and sensor test good, the control board's heater relay may have failed. A Miele-certified technician can diagnose the board electronics.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Washing Machine Heating Element
Part #06260482 · $40–$80
If the element tests open (no continuity)
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