Dryer tumbler dryer not drying clothes and not heating up

Make sure the dryer exhaust tube is clear of lint and not kinked. Next thing I would check are the thermal fuse and thermostat. Check this out: http://removeandreplace.com/2013/09/21/fix-clothes-dryer-heating-drying-clothing/

Try to reset the thermal cutoff, but should be no reason why it should have tripped.
The actual operating procedure is
The air enters the body of the dryer through the large opening in front of the dryer
Then the air is sucked past the heating element and into the tumbler. (the tumbler is the large bin holding your clothes).
Then after the air has circulated around the clothes, it enters the door and is directed down through the lint screen. (this catches lint from the drying process... some clothes producte more lint (such as towels) than others (such as panties) because the weave is more coarse.
Then the air passes through a duct in the front of the dryer (after the lint filter) and into the fan.
The fan forces the air into the duct leading out the back of the dryer, at which point it exits your house.
It is extremely difficult to tell you the problem without being there to eliminate any one of several things that could be the problem. First, when you have the dryer turned on and have the heat setting set to cottons, is there ANY heat at all? If you feel the door, and there is SOME heat but there is not much heat on the clothes when you feel them, the intake opening in front of the dryer is probably in need of cleaning.

While you should always clean your lint filter after each use of your dryer, you should also periodically clean the intake at least once every six months. If you do not, the air intake is eventually restricted and the drying efficiency of the drye is affected. Consult your owner's manual for the exact location of the air intake.

IF THE INTAKE IS CLEAN and clear of obstruction, and there is still not enough heat to dry the clothes, but the door feels warm when dryer is operating. Then this would imply that the exhaust duct needs cleaned out. This is something that definitely needs done periodically to prevent fire. The exhaust duct collects additional lint that the lint filter misses. While this is a small amount of lint, over a period of time, this builds up on the inside of the exhaust duct and prevents the flow of the exhaust which reduces the heated air flow around the clothes in the tumbler. This results in the air not flowing and not becoming warm enough to dry the clothes efficiently.

IF THERE IS NO HEAT AT ALL: Then there is a likelihood that the heater itself needs replacement. This is a costly repair and you will be wise to invest in another dryer instead.

The working process of your clothes dryer is a relatively simple machine. It brings in air, heats the air, flows the air through the tumber where the clothes tumble loosely with the heated air circulating around them, then the air passes through the lint filter as it exits out your home. The lint filter is necessary because those tiny pieces of fabric (lint) can collect in your exhaust duct and catch fire. This is the major cause of dryer fires. This is why you should also periodically clean out your exhaust duct. Even though you have a lint filter, the lint filter does NOT catch all the lint and lint will eventually coat the interior walls of the exhaust duct.

check the filter is clear and the access vent from heater fan to tumbler is not blocked - have seen a sock blocking air flow -
drier is only a fan blowing air over a heated element & through a duct or pipe into the tumbler - on exit the air passes a filter and if this is blocked - through passage is obstructed and hot air will escape backwards

You may have lint issue with the vent hose. If your vent hose has alot of lint in it the dryer will not properly dry clothes. Clear it out really good, take it outside and shake it all out so that its as clean as you can get it and then give it a shot. If it still isnt drying at that point you may have to replace the thermal fuse which regulates the temperature inside the dryer.

is it a condenser or vented tumble dryer

chances are your pullies are gone
this is a cheap fix but a bit complicated to get to the tumbler -Hey you will find lots of change on the process

unplug the dryer.
Open the top lid.
Remove the front panel.
Inspect the blower wheel attached to the motor.
If it moves on the motor shaft replace it.
If iy does not move on the motor shaft, clean the lint out of the exhaust from the blower wheel to the rear of the dryer.

My tumbler won't turn on my front load Kenmore dryer

replace heating coil

first checkyour breaker it may not look like it is tripped but cut it off and on or maybe the thermo fuse or you element is bad you have to check proper voltage to parts