Tumble Dryer is not working - it runs but there is no heat

If it's working for a while then shutting off, sounds like thermal overload.
I'd recommend replacing the heating element depending on the age of the dryer.
It could also be:

1. The cable or plug
2. The interference suppressor
3. The main drum motor or fan motor
4. The control panel
5. The motor starter capacitor
6. An issue with the wiring, e.g. the wires are worn or melted

What To Do If Your Tumble Dryer Is Not Heating Up - YouTube

? 2:33
https://www.youtube.com/watch?v=uWtRXie82oY
Nov 17, 2011 - Uploaded by BuySpares
If your tumble dryer isn't heating up, it's likely that the heater may .... helllo, i have a bosch dryer it works ...

Dryer problems: How to fix a dryer that's not heating up ...

? 3:03
https://www.youtube.com/watch?v=aFXbYp--K5g
Jun 4, 2010 - Uploaded by eSpares
For all your tumble dryer spare parts go to http://bit.ly/1LJTuT6 In this video, Rory shows us how to change the ...

What To Do If Your Tumble Dryer Is Not Heating Up - YouTube

? 2:33
https://www.youtube.com/watch?v=uWtRXie82oY
Nov 17, 2011 - Uploaded by BuySpares
For all your tumble dryer spare parts and accessories, visit: http://bit.ly/1K45iyb If your tumble dryer isn't ...

How to repair tumble dryer when is not heating or drying ...

? 8:52
https://www.youtube.com/watch?v=75l_AtpGkks
Dec 6, 2009 - Uploaded by how-2-repair.com
http://www.how-to-repair.com/help/repair-guides/tumble-dryers/ This usually means ... Up next. Whirlpool ...

Tumble dryer not heating - White Goods Help

http://www.which.co.uk/news/2012/11/safety-alert-beko-tumble-dryers-at-risk-of-fire-303974/

could be thermal limiter fuse in the back of the dryer. this can cause it to not heat but still the drum will turn

replace the belt

how do i clean my heat exchanger on the whirlpool awz 7913 condenser tumble dryer?

You need an ohm meter to do needed checks. Unplug dryer from power,,, then look for sensors and locate the heat coils. Using the ohm meter, check each device by connecting meter to the posts ( your looking for an open curcuit) Note that when you touch the leads of the ohm meter together, the gage will move? This is closed condition, and if the needle did not move, this is called "open". When you find a sensor or heat coil that reads open, that part is bad.
Now make sure there is not a tripped breaker in the fuse panel of the house,,, because even though the dryer is 220 volt,,, 110 volt runs the tumble motor while the other 110 volt curcuit runs the heat side ( so one will work without the other)

A tumble dryer that isn't heating up at all needs checking with a continuity test meter. The most common cause is a heating element failure, or t.o.c's going open circuit. It depends on which make and model of tumble dryer you have as to how easy it is to get to the relevant parts. Some tumble dryers have heating elements that are easily accessible by removing the back panel, and can be tested for continuity or checked for obvious breakage. Others though have their heating elements inside, which aren't accessible without stripping the dryer down. Tumble dryer heating elements are always protected by thermal fuses which are usually simple devices with 2 wires connected. They can be tested for continuity with a test meter
or
If power is getting to the tumble dryer and the socket is definitely OK, then the most common problem with tumble dryers not working is when the door micro switch fails, or the catch on the door that operates the switch either breaks or no longer activates the door switch. Check for broken door catches. There is usually a plastic peg on the door that pushes through a hole in the tumble dryer's casing where the door catch is. Closing the door should operate a simple micro switch. If the plastic peg is broken or bent it might not operate the switch properly

Assuming, the timer is ok and that you can hear the the dryer motor running, it sounds like a broken belt. These kind of failures generally occur suddenly - one day it works, the next day it doesn't.