F40
Miele
Mains Frequency / Power Quality Fault
Display shows F40; refrigerator may shut down or operate erratically after a power fluctuation.
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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 frequency or voltage, Power surge damage, Faulty line filter module
How to Fix / Troubleshooting
Safety: Disconnect power before inspecting the rear electrical area.
Steps:
- Check for recent power issues: If there was a storm or outage, wait for stable power and then reset the unit.
- Use surge protection: Consider installing a whole‑house surge protector; avoid cheap plug‑in devices that may not handle refrigerator loads.
- Inspect line filter: Some Miele models use a separate line filter module. Check for burn marks or swelling and replace if damaged.
Persistent F40 with normal household power indicates internal electronics damage; contact Miele service.
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Repair Difficulty
Hard
4/5
Required Part
Line Filter / EMI Filter Module
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