F20
Miele High Temperature Alarm / Cooling Failure

Alarm and F20 on display; refrigerator or freezer temperature too high.

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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

Compressor not running, Refrigerant leak or sealed system fault, Evaporator fan failure, Door left open or gasket leaking

How to Fix / Troubleshooting

Safety: Do not attempt to open the sealed refrigeration system. Unplug the unit before accessing fans or electrical parts.

Immediate actions:

  • Check doors: Ensure all doors and drawers are fully closed and that nothing is obstructing closure.
  • Inspect gaskets: Look for torn or deformed door seals. Perform the paper test: close the door on a sheet of paper; it should hold firmly when pulled.
  • Listen for compressor and fans: If neither runs, check the household circuit breaker. If fans run but no cooling occurs, a sealed system issue is likely.
  • Allow recovery: After heavy loading or door left open, it may take several hours to return to set temperature. Avoid opening doors during this time.

If F20 persists and the unit does not cool despite compressor operation, contact a Miele technician for sealed system diagnosis.

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Repair Difficulty

Professional Required 5/5

Required Part

Compressor or Sealed System (Technician Only)
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