F78Serious
Miele Dishwasher F78 Error Code
The main control board cannot communicate with a module (e.g., user interface).
Common causes
- Faulty control board
- Broken wiring harness
- Defective user interface panel
How to fix it
- Unplug dishwasher for 10 minutes to reset
- Check all wiring connections between boards
- Inspect for water damage on connectors
⚠ When to call a pro: If reset and inspection do not help, a professional diagnosis is needed.
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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.