My dryer heats but drum will not turn - Whirlpool WED5100SQ Front-Load Electric Dryer

check for the operation of a small micro switch at the door hinge
if that is out of adjustment then the unit will not start

is the drum turning? if not you must replace the strap that turns the drum. if it is heating and the drum is not turning , that could cause a fire.

Hello,
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Your model which we call the 417, is not usually easy to work on. The heating element is located behind the dryer drum. The drum has to be removed to change the element. There is a lot involved but given the cost of a stack unit the element and labor may be worth it.

Belt problem.
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either your heating element,hi-limit switch,cycling heat switch, thermistor,control panel, or you don't have 240 volts supplying the dryer,120volts will still let the drum turn or the timer count-down, its the way there wired

You need to check the drum belt. With dryer empty, reach in and give it a spin. If the belt is good, it will stop in 1/2 turn or less when released. If the belt broke, it will spin almost a full turn.

So,. basically your drum doesnt turn. SO your getting heat still even though the drum isnt turning. Is this right? Sounds strange??? Do you hear any humming noise when you push the start button? I need to know a little more about the problem because im kinda confused as how you decribed the problem. Iv never seen a dryer heat but the drum not spinning. especially your model dryer. Its electric heat right? because if the drum doesnt spin, maybe your motor is bad. and if your motor is bad, then your heating element wont heat up because the centrifical switch in the motor is not switching to complete the circuit to the heating element. So this is why im confused when you said" Dryer heats when knob turned but when "push button" pressed, drum doesnt run." Because your belt wraps around the motor pully and the motor is what makes the drum turn. Like i said, i never seen this model dryer heat with out the motor operating. So if you can give me some more info, ill do my best to help you out....Thanks!!!!

belt has come off or broken

Have you checked the belt? That's generally the problem when a dryer stops spinning.