Interior light stays on even when the door is closed, causing warming inside the cabinet.

Safety: Unplug the unit before working on the door switch or control board.

Steps:

• Check door closure: Ensure the door closes fully and the gasket is not preventing full closure.
• Test door switch: Press the switch manually; if the light does not go off, test the switch for continuity and replace if stuck closed.
• Control board: If the switch is good but the light remains on, the light relay on the main control PCB may be welded closed. Replace the board.