The timer is the brain of the dryer, it is the part that direct electricity to the many different parts in the dryer.

The timer has a small motor that turns the dial from the selected time to the off position

The timer has contact points and with time the contacts will burn out and don't make contact like they supposed to

To check the timer contacts you will need to use a ohms meter to check for continuity between the contacts  that supposed to be close.
 

Loose connections are the major cause for the timer contacts to burn and fail to close

If you suspect that the timer is the problem, first you will need to check all the wires and terminals to make sure that you don't have any burnt wire or terminal

Seeing how to check the timer for continuity is the best way to learn how to do it properly.
 

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