Miele Washing Machine Error Code F20
Heating fault — water not reaching target temperature
The control expected the wash water to reach its target temperature within a set time but the NTC never confirmed it, so the program halts with F20 and washes run cold. A failed heating element is the leading cause, followed by the NTC sensor or the heater relay on the board.
What Does Error Code F20 Mean on a Miele Washing Machine?
Heating fault — water not reaching target temperature.
The control expected the wash water to reach its target temperature within a set time but the NTC never confirmed it, so the program halts with F20 and washes run cold. A failed heating element is the leading cause, followed by the NTC sensor or the heater relay on the board.
What Causes Error Code F20?
Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:
- 1 Heating element failure 55% of cases
- 2 NTC temperature sensor failure 25% of cases
- 3 Heater relay on board failed 20% of cases
How to Fix Miele Washing Machine Error Code F20
- 1
Test the heating element
Disconnect and check continuity — a typical element reads ~20–30 ohms; open means failed.
🔩 Miele washer heater ($60–$140) - 2
Test the NTC sensor
Confirm the thermistor reads in range (see F1/F2).
🔩 Multimeter - 3
Replace the failed component
Fit a genuine element or sensor as diagnosed.
How to Reset Error Code F20
After repair, run a heated cycle to confirm the fault clears.
Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.
Did this guide fix your appliance?
✓ Thanks — your feedback helps us improve this guide for the next person.
Thanks for letting us know. If the steps above didn't work, see when to call a professional.
When to Call a Professional
Heater replacement on Miele washers requires care with the seal and harness — authorized service recommended.
Related Error Codes
Same Code on Other Brands
Error code F20 appears on these other brands too. See every brand that shows F20 →
Find Replacement Parts
Use these links to find the exact replacement parts for your Miele Washing Machine:
External links — ApplianceErrors.com is not affiliated with these retailers.
More Miele Washing Machine Error Codes
Frequently Asked Questions
What does error code F20 mean on a Miele Washing Machine? +
How do I fix error code F20 on my Miele Washing Machine? +
How do I clear or reset error code F20? +
Is error code F20 serious? +
Sources & References
- • Miele Customer Support — official manufacturer documentation
- • Our editorial & verification policy
Content verified against manufacturer service documentation. Last verified: June 14, 2026.