Miele washing machine F20 error code
F20 means heating fault (thermostop). The set programme temperature was not reached in the expected time, so the Thermostop function paused the programme.
Often fixable at home · Fault type: Electrical/hardware
Safe checks, in order of likelihood
- Check the cold-water supply tap is fully on and the inlet filter is clean.
- Check the programme temperature selected is achievable (e.g. not a cold fill on a hot-only programme).
- Restart the programme — the time display pauses while Thermostop runs, this is normal.
Call a professional when…
If the code returns after these checks, book a qualified engineer.
Parts usually involved
- Heating element
- NTC temperature sensor