GE Dryer does not shut off in any mode
 

I have a GE Dryer model# DBSR453EB0WW which is about five years old. The other night I noticed it had been running non-stop for about four hours - and the vent tube was cool. I turned it off and let it sit overnight and through the next day. In the evening I turned it on and it seemed to work, heat came on, etc. When I ran it that evening on automatic mode (moisture sensing) it didn't turn off even though the clothes were dry. The vent tube was warm (as expected) and exhaust air outside of the house was moving as expected indicating no blockages. If I run the dryer in straight timer mode it counts down to around 20 minutes and stays there running until I shut it off.

Is this a thermostat problem? If so which one? I believe this dryer has two maybe three of them.

If you run it on the timed cycle and it won"t shut off, it has a bad timer...If it won"t shut off on the automatic cycle that"s a different deal....

That's what's strange to me. It won't shut off in automatic cycle; and in regular timed mode it essentially won't shut off. I set the timer for 30 minutes last night and an hour later it was still running showing just under 20 on the dial. And the clothes were perfectly dry.

It probably has a bad gear in the timer..Maybe a missing tooth on the gear right around the 20 minute mark...You would need to check for 120 volts at the timer motor to prove it....

I hadn't thought of that. Thanks for the tip!