SOURCE: dryer shuts off properly on
ck thermal fuse top of element housing part #279816 could be timer but doubtful
SOURCE: Roper electric dryer. Clothes not drying. Temp ok/timer not?
I would supect a faulty high limit thermostat. This small round device is mounted to a metal plate and attached to the internal ductwork. It can be tested using a multimeter or ohmmeter. Test for continuity. It should have none. Hope this helped and best wishes.
A timed drying cycle uses the timer alone to stop the drying cycle. Once it times out like an egg timer a set of contacts open up shutting off the dryer. Or a set of contacts closes to activate a relay which in turn shuts off the power.
Auto dry usually uses a moisture sensor which would do the same thing as the timer. Once it doesnt sense moisture in the load for a predetermined time it in turn triggers a relay which shuts the power off. Some auto dry cycles just use the timer alone and guess-timate the drying time by the selection.
If yours does not use a moisture sensor then most likely it is your timer/cycle switch. There may or may not be a relay involved.
Most dryers have a basic wiring diagram on the inside somewhere on one of the panels which will help.
Since yours is acting up on both cycles Im guessing you have a bad relay or connection to that relay somewhere IF it uses a moisture sensor.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/john_32f4b76dad4781c4
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