On a Bosch Wt3500 I was getting no heat.
I removed the central back panel, which is a curved panel containing the fan and the heater element. Once the back pannel was removed i vacuumed away the dust. At the top there was a wire with a black housing (roughly size of a golf ball) with a small red button. Pressing that has returned heat to my tumble dryer. (I assume it reset a heating switch)
Andrea, May 2006
