Miele Dishwasher Error Code F20: How to Fix It

Medium 1-2 hours High Severity Verified June 2026
Error Code
F20
Brand
Miele
Product Type
dishwasher
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Miele dishwasher error code F20 indicates a heating fault where the heating element is not properly warming the water. This prevents your dishwasher from reaching the correct temperature for effective cleaning and sanitizing.
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Tools You'll Need

How to Fix Error Code F20

  1. Turn off power and water supply

    Always disconnect power before working on electrical appliances to prevent shock or electrocution.
  2. Check for basic obstructions

  3. Test the heating element for continuity

    Ensure power is completely disconnected before touching any electrical components.
  4. Inspect wiring connections

  5. Check the water temperature sensor

  6. Test the control board relay

    Control board diagnosis and replacement should only be performed by qualified technicians due to complex wiring.
  7. Replace faulty components

    Use only genuine Miele replacement parts to maintain warranty coverage and proper operation.
  8. Restore power and test

Parts You May Need

Dishwasher heating element
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Temperature sensor (thermistor)
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Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
Dishwasher heating element
Check Price on Amazon
Temperature sensor (thermistor)
Check Price on Amazon
Wire harness connectors
Check Price on Amazon
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When to Call a Professional

Call a professional technician if the control board needs replacement, if you're uncomfortable working with electrical components, or if the error persists after replacing the heating element and temperature sensor. Also seek professional help if you discover extensive wiring damage or water damage to electrical components.

Frequently Asked Questions

Can I still use my Miele dishwasher with F20 error?
No, you should not use the dishwasher with error F20. Without proper heating, dishes won't be sanitized and may come out still dirty or greasy.
How much does it cost to fix Miele F20 error?
DIY repair costs $50-150 for a heating element or $30-80 for a temperature sensor. Professional repair typically costs $200-400 including parts and labor.
Why does my Miele dishwasher heating element keep failing?
Repeated heating element failures can be caused by hard water buildup, power surges, or a faulty control board sending incorrect signals to the heater.
How long should a Miele dishwasher heating element last?
A properly maintained Miele heating element typically lasts 5-10 years depending on usage frequency and water quality in your area.
Will F20 error damage my dishwasher if ignored?
While F20 won't cause immediate damage, continuing to run cycles without proper heating can lead to poor cleaning, bacterial growth, and potential damage to other components over time.