Very hot at back, making humming noise, but drum isn't spinning.

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

hi take top off hold back of drum see if u can pull it up if you can feel play its more than liklely the bearing wot dryer is it

replace the broken drive belt

See if you can spin the drum with little resistance or is it really hard to spin?

probably a bad wheel bearing

Look for something in the blower housing


Service Manual and more photos HERE



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sumanth m 's answer may well be correct because I have the same dryer and it has the same problem. I got a massive electric shock off mine and so I think the buzzing is a protection measure against a short circuit

replace capacitor on motor

If there's no water at all, make these checks:

• Is there water getting to the machine?
  Check to be sure that someone did not turn off the water, usually the faucet or faucets are on the wall behind the machine.
  
• Is the water-volume selector switch set properly and are the control panel buttons pressed in all the way?
  
  
• If you have a Maytag® washer, is the fuse (if there is one) in the control panel at the lid-switch bracket blown?
  
  
• Is there a faint buzzing or humming noise coming from the water-inlet valve? (The water-inlet valve is the device on the washing machine that the fill hoses are attached to.) If you can't hear anything, the water-inlet valve may not be getting any power. If you can hear some noise and there's water present, you may need to completely replace the water-inlet valve.