Display shows E10; unit may shut down unexpectedly or not respond to controls.

Safety: Disconnect power before accessing the control compartment.

Steps:

• Remove the front grille or upper control panel (depending on model) to access the main control board.
• Inspect all harness connectors for secure fit. Reseat each connector one at a time to ensure good contact.
• Look for signs of burned components, corrosion, or moisture on the control board. If present, the board should be replaced.
• Check that the unit is on a dedicated circuit and that line voltage is stable. Avoid using extension cords or power strips.
• Restore power and attempt a control reset (often by holding specific buttons or cycling power for 5–10 minutes; refer to the Marvel user guide).
• If E10 persists and wiring is intact, replace the main control board with a Marvel OEM board. Transfer any jumpers or programming plugs exactly as on the original.

Because this fault involves electronics and possible firmware, many homeowners prefer to have a Marvel‑authorized technician perform the board replacement and any required programming.