I have just repaired my tdc30 with the same problem.I had to replace BOTH the [heater cut out kits] as they are apparently called at the rear of the machine. These are located at the rear behind a 2" cover held on by 2 screws. To REPLACE THEM SIMPLE UNSCREW THE COVER,AND THEN UNSCREW THE 2 CUT-OUTS AND REMOVE THE 4 WIRES,-MAKING SURE NOT TO MIX THEM UP AND REPLACE. I TOOK A PICTURE AND DREW THEM ON THE BACK OF THE MACHINE SO I DID NOT MIX THEM UP.The part number for these wear (1701583 Green spot) 6Kg condenser tumble dryers from date code 65 (May 1999). Please check the part number of your machine before you order any from Hotpoint. 17£ FOR THE PAIR. Good luck, it is a very easy repair.
lee jones Windsor, April 2006