Oven interior light stays on even when the door is closed.

Safety first: Disconnect power before testing the door switch.

• Check door closure: Ensure the door closes fully and compresses the gasket evenly. Adjust hinges if needed.
• Inspect door switch: Locate the door switch (usually near the door frame). Press it manually and listen for a click. Test continuity with a multimeter; replace if stuck closed.
• Check wiring: Inspect switch wiring for shorts or damage.
• Control board: If the switch and wiring are good but the light remains on, the control board's light relay may be stuck; replace the control board.