Our dryer is less than 3yrs old, the timer knob can be turned completely around but will not engage, the start button also can not be pushed in. Is this a problem with the timer motor???
On the timer knob not engaging to move the dial to the desired selection then the issue would most likely be with the knob. As far as the push to start switch not engaging to start the unit then the issue will be with the start switch which would need to be replaced.
The dryer does not turn off by itself. If the door is closed it conitunes to run.
With the unit not shutting off on its own, this would be a stuck relay on control board. The part number that is needed would be WE4M488.