Microwave shows E41 and will not start; sometimes accompanied by beeping.

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 UI board and main PCB, Corroded connectors, Failed user interface board, Failed main control board

Safety: Unplug the microwave before removing the control panel.

User-level actions:

Power reset: Disconnect power for 10 minutes to clear transient communication faults.

Technician-level actions:

Remove the control panel to access the display/UI board and its wiring harness.
Reseat all connectors between the UI board and main control board.
Inspect connectors for corrosion or heat damage; clean or replace as needed.
If reseating does not resolve the issue, substitute a known-good UI board or main board to isolate the faulty component.

Hard 4/5

User Interface Board

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