Oven shows E20 and internal communication between boards fails; some functions may work, others not.

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.

Possible Causes

Loose harness between user interface and power board, Damaged communication cable, Faulty UI board, Faulty power board

Safety first: Disconnect mains power before accessing internal boards.

Inspect harness: Locate the multi-wire harness between the display/touch board and the power/control board. Reseat both ends.
Check for damage: Look for pinched, cut, or burned wires along the harness route.
Test boards individually: If possible, substitute a known-good UI or power board to isolate the faulty module (usually a technician task).

Replace the damaged harness or the defective board. Because this involves multiple high-voltage circuits, professional service is recommended.

Professional Required 5/5

User Interface Harness

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