Timer buzzes then shuts off dryer

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.

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I assume you're talking about the buzzer. Many high end dryers do that until you remove the clothes. heated clothes can set wrinkles if kept in the same position for a long time. it's a feature, not a problem, unless it keeps buzzing after you remove the dried clothes!

if it's not advacing in time dry you have a bad timer,that timer should count down no matter what the dryer is doing,if you have it in auto then it could be no heat,when it's in auto or more or less cycle the heat comes on and the timer won't move until the heat shuts down,when the heat is off timer advances,when the heat starts the timer stops,it will do this until the clothes are dry and then timer will shut off but in timed cycle,timer isn't counting down get a new timer.

It could be,, moisture is caused when a dryer can't vent properly,, so clean out all the vent lines from the machine, and include the outside vent cover

bad timer moter. replace timer

Hey Bio, Its either the timer or the moisture sensor.

if you set timer on time dry it will count down but if you have it set on more or less it will not advance without heat,change out the heater and you will be fine

if it was set on timed dry replace timer if it was on auto dry check element thumbs up

Probably has a bad timer

is there enough heat? should be about 160 ^ f drying sensor can only be one of two things, make sure you didn't change wires when you reinstalled it or the timer is bad. may have multiple problems.