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

Check door switch actuator: Locate the door switch in the door frame. Ensure the door presses it fully when closed.
Test switch: Remove the switch and test for correct open/closed operation with a multimeter. Replace if stuck or faulty.
Inspect wiring: Check for shorted or pinched wires around the door area. Repair any damage.
PCB check: If the switch and wiring are good, the control PCB may be keeping the light on and may require replacement.

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

Possible Causes