Dryer drum light stays on even when the door is closed and cycle is running; no error code.

Safety first: Unplug the dryer before accessing the door switch or wiring.

• Check door closure: Ensure the door closes fully and the strike engages the switch actuator.
• Test door switch: Access the switch and test it with a multimeter. Replace if it does not change state when the door is opened/closed.
• Inspect wiring: Look for shorted or pinched wires between the switch and drum light circuit. Repair as needed.