Have had exactly the same problem on a Hoover Nextra Tumble Dryer. Thought it was the "ON" Button so swapped the leads over to adjacent "Acrylic/ synthetics" switch and drum rotated but had buzzing sound. I think the on switch is just non latching and so this is not the problem. Pressed button in and out and could actually see arching inside relay on PCB adjacent to Control/ Timer module so I think this is the problem and agree with earlier findings. The part number for the relay is Tyco Electronics RT314024:
Product Highlights:
* RT1 Series
* Contact Arrangement = 1 Form C, SPDT, 1 C/O
* Contact Current Rating = 16 Amps.
* Monostable Coil Magnetic System
* Without Coil Suppression Diode
Will try to find cheapest way to source the component (i.e. without large delivery charge) and advise on outcomes (I could find the relay for a couple of quid but the delivery charge was £15).
btw to replace the relay you will need to be able to solder on a PCB.
Tommy MacSuibhne
October 2007