F9
Miele
Power Supply / Low Voltage Fault
Microwave shows F9 and may not respond to input or may reset unexpectedly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Unstable mains supply or undervoltage, Defective low-voltage power supply on control board, Loose neutral or live connection at terminal block, Internal fuse or varistor damage
How to Fix / Troubleshooting
Safety first: Turn off the circuit breaker and verify power is off before accessing the terminal block or internal wiring.
- Check outlet and circuit: Plug another appliance into the same outlet to verify stable power. Avoid using extension cords or power strips.
- Inspect power cord: Check the Miele microwave power cord for cuts, kinks, or burn marks. Replace if damaged.
- Verify terminal connections (built-in models): For hardwired or built-in units, remove the access cover to the terminal block and ensure all screws are tight and wires are secure.
- Power reset: Turn off the breaker for 5–10 minutes, then restore power and test.
- Internal power supply: If F9 persists, the low-voltage power supply on the main control board may be faulty. This requires board-level replacement by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Module (Low-Voltage Power Supply Section)
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