Dryer drum won't spin/tumble clothes

check vent line and or clean vent line inside dryer, clean vent line. Felt is probably drum seal.

Whirlpool AWZ233 Tumble Dryer Parts

Most of the time a tumble dryer will work like a dream but, as with all appliances, occasionally there will be technical problems.
If your tumble dryer is making a banging, whining (or other strange noise) it's best to diagnose and sort out the problem. It could be the result of a number of things, but what you certainly don't want to do is ignore it.
Here are the most common reasons for your tumble dryer making odd noises.
Coins and keys
One of the most common reasons for a banging, rattling or clanking is keys or coins left in pockets - so always check them before you put any clothes in the tumble dryer. More often than not you won't hear anything until the dryer cycle is in full spin.
Uneven surfaces
If the dryer is vibrating or shaking during spinning, check to make sure the dryer's sitting on a level surface. If it's fitted with height adjusters on the front legs, adjust them accordingly to ensure the machine is level as this will often reduce or eliminate the banging sound.
Drum bearings
If the tumble dryer is noisy when its turning and the whole appliance is shaking and rumbling, it could be indicative of a problem with the drum bearings, which help the wheels turn freely and easily.
The drum
If the banging noise is continuous when the drum is turning then it might be problem with the drum itself. If the noise is a metallic one, it could be the result of the drum scraping on something inside the machine. You could always check the drum visually for any marks or dents.
Motor bearings
If the tumble dryer is emitting a high-pitched screaming or whining noise it could be a sign that the motor bearings are wearing out.
Tension pulley wheels
If there's a squeaking noise coming from the dryer it could be the result of wear on the tension pulley wheels. This occurs more frequently on older models...or try this link..
Common Tumble Dryer Problems

Unplug the unit and take the top with the screws holding the lid on. Take a look at all of the wires on the top of the machine. You might notice broken/burnt wires on the safeties that are close to or that directly activate the heating element located in the blower housing located at the top of this washer/dryer condensing unit.

This dryer has 2 belts. A smaller belt operates the blower. The nut tends to back out and the small belt falls off. Here is the result:
Bravos dryer innards of a failed blower belt
Look around on my foggy site for your service manual. Let me know

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Someone is going to have to get inside to see if the belt (it should have one around the drum) is broken or the motor that drives it is seized, etc.

Need to see if drum turns and if too freely my money would be the belt.

Is yours the gas model? If so I need you to look for some things. Open back door panel and see if while trying to light the igniter is glowing orange. Sea Breeze

window.google_render_ad();There are many places & parts that could be causing your Whirlpool dryer to be noisy. To find out what is causing the noises, you need to find out where are the noises coming from.
Start the dryer and let it run for a while and listen to try to pinpoint where in the dryer the noises is coming from. Once you have an idea of the area, you will need to disconnect the dryer from the wall outlet and take the dryer apart.
Below you will find the parts that you need to check when your dryer is noisy.
The drum baffles:

The drum baffles are use to tumble the clothes inside of the drum, in other words, the baffles job is to separate the pieces of laundry as the drum turns.
When the dryer is getting older and if you use the dryer a lot, the drum baffles holding screws will become loose. Loose drum baffles will cause noises. All you need to do, is to open the top panel and tighten the drum baffles holding screws.
The drum support rollers:

These dryers uses four drum support rollers, tow on the front and two on the rear. The job of the drum support rollers is to keep the drum tumbling smooth.
When the grease on one of the rollers dry out, the roller start to make squeaking noises and the roller bearing will start to wear out until the bearing on the roller is gone. When the bearing on the roller is gone, the noise will change from squeaking to a clanking noise.
The blower wheel:

The blower wheel is use to circulate the air inside of the dryer drum. The most common Whirlpool blower noises are cause by something falling inside of the blower housing and hitting the blower when the motor runs.
The Idler pulley:

The Idler pulley is use to apply the necessary tension on the belt. There are two types of idler pulleys, the pulley with the wheel and the pulley with the teflon slide. A bad idler pulley could cause a Whirlpool dryer to be noisy.
The drive motor:

Worn out bearings on the motor will cause the motor to run kind of noisy. When the motor starts making noises, the solution to this problem is to replace the motor.
The belt:

The belt on most dryers is only about1/4 inch wide. These belts work very hard making the drum tumble. When the belt stretch just 1/2 inch more that it supposed to, the belt will start slipping and that could cause your Whirlpool dryer to be noisy.
As you could see, there are a lot of parts that could become noisy in your dryer. When your dryer starts making noises, make sure to check it out before it gets worse.

Possibly the belt assembly. if you open the door and try to turn the drum does it turn with a little resistance, noises? this model has rollers, pulley, and a four groove belt 92 1/4" , sometimes the pulley sticks after yrs of use, belts wear, drum misaligns. the humming should be the motor trying to work.

The way most domestic clothes dryers are made, it's usually hard to determine that the heating part works without the drum turning.

But, chances are, the drum belt is broken.

Please give the specific model number of your unit for a more complete response.