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Dryer drums spin on a felt cover lips - one on the front and one on the rear wall. It is turned by a belt connected to a motor on the bottom of the dryer.
The drum should be able to be turned by hand - unless something is jammed between the drum itself and walls, etc.. You'll need to open the dryer to inspect the drum, the sides, etc. Check the belt while you're at it too. A video the details the dryer belt replacement (and dyer disassembly) can be found here.
If you need additional help - please be sure to include your dryer manufacturer and model number. BTW - WPD Comms? If not - disregard!
If you can turn the drum and then the dryer starts you have a bad motor. The way the dryer works is when you initially push the start button, electricity is sent to the start winding, or stator, of the motor. This will in turn start the motor turning. From there the stator will drop out of the electrical process and at the same time the run winding, or rotor, will take over and the motor will continie to run. Your stator is damaged, has a burn spot, etc so by you turning the drum, the belt around the drum is moved which is attached to the motor pulley. You basically take the place of the stator. Long story short, you have a bad motor.
Check to see if the drum will turn by hand. If so, leave the door open but push the light switch button down and start the unit. Once you hear the humming sound, manually turn the drum with your hand to start. If the drum turns normally, you have a bad motor and needs to be replaced. If the drum does not turn, something is jamming the motor and needs to be disassembled and inspected.
There are three possible reasons why the drum doesn't turn.
Broken belt. You replaced the so in this case it's not.
Door switch. The dryer will not operate if teh door switch is defective. It is inside the drier main housing near the door frame. You need to raise or open the top or front of the dryer to reach the switch. Replace if defective.
Motor. If the motor hums when the start button is pressed, the motor maybe burned-out. Check the dryer motor:
Check the blower fan housing for obstruction and manually turn the motor shaft.
If the motor is very stiff or cannot be turned manually, you need to replace the motor.
If the motor rotate freely, run the motor without the belt. If it runs fine, there maybe problem with the idler pulley or the clothes drum.
Rotate the drum by hand. If it is difficult to rotate it, correct any problem with the rollers or pulley. Reassemble the dryer and try it again.
If the motor hums but does not run on it's own even without the belt,but can be turned freely by hand, you need to replace the motor start capacitor or the motor itself.