Hotpoint TC71 condensor- tripping mains circuit breaker -when off?

I have the door open and the time right of, s the motor and heater will not work when plugged into the mains. But as soon as I switch on the mains it trips the circuit breaker. I have opened up the top and disconnected the suppressor, so it's not that.
Any other possibilities. A hotpoint service call out, fixed price = £124 !!!!!!!!!!!!! new dryers don't cost much more .