Wont stay running

Sounds like you have a start relay going bad. I don't have a wiring diagram here to check if you have a relay or just a button.

As long as you're sure it is plugged in to an outlet that has power (make sure the breaker is not tripped), there are 2 things that keep a dryer from starting. There is a switch that needs to connect by the dryer door being closed. and there is a switch on the belt tensioner that shuts the dryer off when the belt breaks, and will not allow it to restart until the belt is replaced. Check the drum drive belt to see if it is broken, that is the most likely cause.

motor may need to be replace

This usually means that your belt is broken once you replace the belt in the dryer it should turn the electric motor in the dryer and you should be fine

he "broken-belt" switch is open due to your broken drum belt,replace the belt and it will start,its there to reduce the fire hazard from the drum not rotating and the clothes starting on fire from this,it shuts off the heating element also

sounds like you broke a drive belt, remove the dryer shell and you should find the broken belt pretty easily you can also replace it yourself it is a relatively easy job......HAVE FUN ........YOU CAN DO IT!!!

I just replaced the motor on my Whirlpool which was 12 yrs. old. The motor bearings get bad and let the rotor move off-center and bind. There is a thermal overload in the motor that shuts it off when it gets too hot.
My solution: new motor, the belt is unrelated to the problem.

Your dryers timer contacts have fused to gether.
The only repair is to replace the timer.

probably broken belt some dryers have broken belt switch that shut dryer off if belt broke