Oven interior light stays on permanently, even when door is closed and oven is off.

Safety first: Isolate power before working on the door switch or control board.

• 1. Check door switch: Locate the door switch plunger and press it manually. If the light does not go off, the switch or control is faulty.
• 2. Test switch continuity: With a multimeter, verify that the switch opens when pressed. Replace if it remains closed.
• 3. Inspect door alignment: Ensure the door fully depresses the switch when closed. Adjust hinges if necessary.
• 4. Control board relay: If the switch is working but the light remains on, the lamp relay on the control board may be stuck closed. Replace the control board.