Trigger
The drum started when the door closed
The control panel did not need to be switched on.
Stuck-relay evidence · LG dryer
Closing the Door Energized the Drum with the Controls Off
The door switch completed a path that should not have driven the motor while the dryer was off. A stuck board relay was proposed and board replacement closed the same symptom.
What the source establishes
- Closing the door started drum rotation even when the dryer was switched off.
- When the dryer was turned on, the drum still rotated but heat did not operate normally.
- An expert identified a stuck relay on the control board.
- Tapping the relay was attempted and did not help this unit.
- A technician with the same symptom replaced the board and explicitly reported that everything worked afterward.
A similar symptom can have a different cause on another appliance or model.
How the evidence narrowed the diagnosis
Powered state
Rotation continued without normal heat
The motor command and heat behavior no longer followed the selected state together.
Supported branch
A stuck motor relay fit the pattern
Board replacement resolved the same reported behavior in another technician's dryer.
What the evidence supports
The explicit expert diagnosis and successful same-symptom board replacement support a stuck motor relay on the control board.
What should be verified next
Disconnect the dryer and preserve the model before ordering parts. Qualified service should confirm that the motor output remains energized incorrectly and match the board to the exact appliance.
Cases closest to this diagnosis
Unexpected-start safety: unplug a dryer that begins tumbling while switched off. Do not reach into the drum or access the board while it remains connected to power.