You mean it trips the RCD? This indicates an earth fault not an overload condition. There is no capacitor on the motor. There is a mains interference capacitor on the machine but these rarely fail. You say the machine works fine empty...do you mean it works fine on a spin program, cold wash program, temp program...what?? It is important to know the difference. I suspect you have an earth fault on the heater element & this is what trips your rcd.
An earth problem is very a serious condition. If your rcd malfunctions you could risk serious injury or death by electrocution. DO NOT use any appliance that has developed a problem of this nature. Pull the plug & seek qualified assistance.
Mike, October 2009