2 answers heating element gone or overheat thermostat not working this is on drum casing in case of over heat sometimes if element is half gone it will trip your rcd when elements are used over a length of time they become worn thus just like a cooker hob that has saucepan rubbed across it a few hundred times depending on make some elements can be removed by them selves others you need to take out drum hope this helps
mr sheene
March 2010