when you're not,you're not.
Electric dryers work very basicaly.
You have a heat element that plugs in the back, (there should be a cover that you unscrew) and You have a motor that spins the drum.
If you never have heat, then you should change the element.
If you have heat and the clothes don't dry, then you need to clean the dryer vent and probably the whole line. Most times the hose behind the dryer is crimped and the lint builds up there.
As far as the timer, I only use the manual timer but, I'm pretty sure the reason the other ones run forever is because the clothes are not dry.
At the end of the timed cycle, are the clothes dry?
I would unplug the electricity from dryer and remove the cover plate and remove the element and go to the Sears repair shop have them test it.
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