F43Serious
Miele Dishwasher F43 Error Code
The relay that controls the heating element is defective.
Common causes
- Faulty relay on control board
- Short or open heater circuit
- Control board failure
How to fix it
- Test heating element continuity
- Check relay operation with multimeter
- Inspect for burned or damaged components on board
⚠ When to call a pro: If relay is bad, the control board will likely need replacement.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.