Dishwasher does not power on at all; no lights or display, even when the door is closed.

Safety first: Do not work on live circuits. Disconnect the appliance from the mains before opening any panels.

• Check household supply: Verify that the wall socket has power by plugging in another appliance. Reset any tripped breakers or replace blown fuses.
• Inspect power cord: Check the Grundig dishwasher's power cord for cuts, burns, or crushed sections. Replace if damaged.
• Check mains filter: Remove the lower front panel and locate the mains filter (EMI filter). Inspect for burnt smell or visible damage. Ensure connectors are firmly seated.
• Control board inspection: Remove the inner door panel to access the main control board. Look for burnt components or damaged tracks. If the board is visibly damaged or there is still no power after verifying supply, the control board likely needs replacement.
• Professional service: If you are not experienced with mains voltage diagnostics, contact a qualified technician to test and replace the mains filter or control board.