F9
Miele Mains Power / Voltage Fault

Freezer displays F9 and may shut down or not start; sometimes accompanied by tripped breaker

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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

Supply voltage out of range, Loose mains connection at terminal block, Damaged mains filter (EMI filter), Faulty power supply section on main PCB

How to Fix / Troubleshooting

Safety first: Turn off the circuit breaker and unplug the freezer before inspecting mains connections. Only work on mains wiring if you are qualified.

Steps:

  • 1. Verify supply: Check that the outlet provides the correct voltage and is properly grounded. Avoid using extension cords.
  • 2. Inspect mains cable: Look for cuts, kinks, or burn marks on the power cord. Replace if damaged.
  • 3. Check terminal block: Access the mains terminal block (often near the compressor or control board). Ensure all screws are tight and there are no signs of overheating.
  • 4. EMI filter inspection: Many Miele freezers use a mains filter module. Inspect it for cracks or burn marks. Replace if damaged.
  • 5. Control board power supply: If external wiring is fine, the internal power supply on the main PCB may be faulty. This typically requires replacing the control board.

Warning: If breakers trip repeatedly, stop using the appliance and contact a qualified electrician or Miele service.

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Repair Difficulty

Hard 4/5

Required Part

Mains Filter Module
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