Dryer drum light stays on even when the door is closed and the cycle is running.

Safety first: Unplug the dryer before working on the door switch.

• Check door closure: Ensure the door fully engages the switch actuator.
• Test switch: Access the door switch and test continuity between terminals with the door open and closed. Replace if it does not change state correctly.
• Inspect actuator: Make sure the plastic actuator on the door is not broken or worn.
• Correct any wiring issues and reassemble. Verify that the light turns off when the door is closed.