i have the same problem (if i disconect the wiring to the heater at muti plug dryer works but NO heat ) however just found this and going to try it now
how can i fix my hotpoint aquarius tdc32 condenser dryer?
have a read of the answer below
it most likely a heater fault, its possible that small metal object is lodged around heater causing short circuit, turn off, take lower back plate off & have a look. hopefully your find something, if you do it will have probably blown the thermistats so you will need to replace. If not you will prob need to replace heating element, its a simple job, dismount heater, refit new one then refit one cable at a time. Look for parts on e-bay prices pretty good, good luck.
simon
February 2008
paul, December 2009