E20
Neff
Main Control Board Power Supply Fault
Display shows E20 and the refrigerator is not cooling; compressor does not run.
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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
Failed low-voltage power supply on main PCB, Burnt components on control board, Surge damage, Loose power connectors to PCB
How to Fix / Troubleshooting
Safety: Unplug the appliance. The control board contains live mains circuitry.
Steps:
- Access main PCB: Typically located in a housing at the rear or top of the refrigerator. Remove the cover to expose the board.
- Visual inspection: Look for burnt areas, bulging capacitors, or cracked solder joints.
- Check connectors: Ensure all plugs are fully seated and not heat-damaged.
- Basic test: If you have a multimeter and are competent, you can test for correct DC output voltages with the unit powered (only if you are trained and can do so safely). Otherwise, do not work on live boards.
- Board replacement: If there is obvious damage or E20 persists after reseating connectors, replace the main control board with the exact Neff part number. Transfer any configuration jumpers as per service documentation.
- Professional help: Because of mains voltages and potential for miswiring, board replacement is best handled by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (PCB)
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