The dryer has a long, thin belt that goes around the drum and two pulleys. One pulley is for tension and the other is on the motor. With regular use, this belt can break over time. If the belt breaks, the drum won't turn. To check if the belt is broken, reach into the dryer and try to turn the drum by hand. If the drum spins very easily, the belt is probably broken. Look at the belt to confirm it is broken. If the belt is broken, you need to replace it. Replacing the belt will allow the drum to turn again.
If your dryer drum is not turning, it's probably not because of a bad timer. That rarely happens. First check the parts that usually break. If everything else is working right, then test the timer. Use a multimeter and wiring diagram to check the timer. If the timer is bad, replace it. But again, the timer is not likely to be the problem if the drum won't turn. Look at the other parts first before replacing the timer.
Most dryers have two rollers in the back of the drum. Some also have two rollers in the front. The rollers need to spin easily to work right. If the rollers are worn out, the drum can't turn properly. To check the rollers, take off the belt and try turning the drum by hand. If the drum doesn't spin freely, the rollers may be worn out. Look at the rollers to see if any are worn. If one or more are worn, replace all the rollers at the same time to prevent future issues. You can reuse the roller shaft if it's in good shape. Make sure to clean the shaft before putting on the new rollers.
The blower wheel in the dryer moves air through the drum. The motor that turns the blower wheel also runs the belt for the drum. So if the blower wheel gets blocked, it could stop the drum from turning too. Check the blower wheel and housing for anything blocking it. If you see an obstruction, replace the blower wheel or housing. Replacing the part will help get the drum turning again.
A dryer's control board controls the voltage being sent to all of the appliance's electrical components. If the board is defective, it may interrupt voltage to the drive motor resulting in the drum not turning. You can inspect the board for signs of damage or a shorted component. You can also use a multimeter to test for voltage reaching the drive motor after reviewing the dryer's wiring diagram.
Most dryers have two rollers in the back of the drum. Some also have two rollers in the front. The rollers need to spin easily to work right. If the rollers or axles are worn out, the drum can't turn properly. To check them, take off the belt and try turning the drum by hand. If the drum doesn't spin freely, the rollers or axles may be worn out. Look at the rollers and axles to see if any are worn. If one or more are worn, replace all the rollers at the same time to prevent future issues. You can reuse the axles if they're in good shape. Make sure to clean the axles before putting on the new rollers.
The drive motor turns the drum and blower wheel to push out the air. First, see if the motor makes a humming noise. If it still hums, take off the belt from the motor. Then check that nothing is blocking the blower wheel. Next, with the belt off, try to turn the drum by hand. If the drum doesn't spin easily, find out what's stopping it from turning. If the drum spins freely and nothing blocks the blower, the drive motor may be bad. If you think the motor is the problem, replace it. That should fix your dryer.
A dryer repair kit usually has a new belt, idler pulley, and may also contain rollers, a rear drum bearing, a felt seal, and other parts. A broken belt, bad idler pulley, and worn out rollers or bearings are the main reasons a dryer drum won't turn. So putting in a new maintenance kit should fix the problem of the drum not spinning. The kit replaces the parts that typically cause the drum to get stuck.
The main control board in a dryer controls the power going to all the parts. If the board is bad, it could stop sending power to the motor. This would make the drum not turn. Look at the board for any damaged or shorted parts. You can also use a multimeter to check if power is getting to the motor. First check the wiring diagram for the dryer. Replacing the control board can fix the problem if it's not giving power to the motor.
Look at the idler pulley for the dryer drum belt. Make sure it can spin easily on the shaft. If the idler pulley is stuck, worn out, or damaged, you should replace it. When you replace the idler pulley, also put in a new belt for the drum drive. Replacing both together will help make sure your dryer runs properly.