Generically speaking, no heat in an electric (is that what you have?) dryer is commonly caused by the heating element opening up ( going bad), or possibly a bad temp sensor.
Someone will need to open it up and determine which one has malfunctioned, as you cannot determine this by your description alone. If you're "flying blind", you can search the internet to see what others have found with their Servis M2002S.
More info is needed...
Jim in Tucson
January 2011
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.