I Have a GE dryer bought about 2/03 model DBL333GB4MW that all of a sudden stopped heating now when the clothes spin the air is cold the clothes don't dry no matter what size the load is. I don't know if this is relevant the serial no. is DF706124W. Can you assist me.

The heating element assembly warms the air before the air enters the dryer drum. If the dryer won't stop, it may be because the heating element assembly isn't working - which greatly increases the drying time. Check the heating element for continuity. http://www.repairclinic.com/RepairHelp/How-To-Fix-A-Dryer/7-3-850356-/GE-Dryer-won-t-stop-DWSR463EG7WW
This GE Website has descriptions and videos you can watch. Also shows the price of replacement parts and the skill level needed to preform repairs yourself.

Yup...heating element (usually there are two) is done. Likely the first one was done long ago and the second has finally died.

I just bought a new one- (lunarreacher at yahoo.com) write me about parts. I took it apart before the new one came today.

How to Replace A White Knight Tumble Dryer Heating Element Heater and Thermostat

For a full list of appliance Video Repair help see our video section
White knight tumble dryer not heating this video show you how to change and fit a new heating element and thermostats can be used on Ariston, Electrolux, Ignis, Neutral, Tricity Bendix, Whirlpool,
Here is the element in this video
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The easiest way to find you part is put your model number into our search bar at http://www.apart4u.co.uk/ TEL 08455218000
http://www.apart4u.co.uk/news/category/questions-and-answers/diagrams/

dryer spins fine but wont heat

If you can turn it on and have the door open, hold the door switch in and see if you have a glow from the heating element. If not, your element is broken. That is if it is an electric dryer. If it is a gas dryer you need to check the pilot light or the thermo sensor.

heated air enters the dryer at 140 degrees farenheit,
a portion of the heat energy raises the temperature of the water in the clothes.
When the clothes are cold and wet, the difference is large transfer is rapid
a lot of heat transfers to clothes and the exhaust air is damper and colder
As the clothes get warmer and dryer, proprtionally less heat is extracted from the incoming air, and the exhaust air is warmer and dryer.
When the clothes are dry, and at 140 degrees, the same temperature as the incoming air. no heat is removed from the incoming air
the dryer should then stop heating, draw unheated air through the drum and clothes to cool, and reduce wrinkling
then switch off

the dryer appears to be operating correctly

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

check the fuses.one runs and other heats it.might be a wire burnt off in the back or on the motor