Flippantly - diagnose and repair the fault.
I would guess that a fan blows air across a heating element and the warmed air is directed to the clothes tumbling in the drum.
The heater/fan combination has probably failed in some way - I would guess the heating element.
Again - somewhat flippantly - your choices are...
Do nothing
Buy a new dryer
Attempt diagnosis and repair yourself
Have somebody else diagnose and repair
Good luck...
Peccavi, September 2010
