Hotpoint aquarius CTD00 problem?

I have had an engineer out twice in 7 weeks for the same problem, when i switch it on the fuses all trip, they both said its down to cleaning it out, but i have had the dryer now for 5 years and this has never happened before and i am cleaning it out, so am just wondering if they could be another reason this is happening and if not how can i stop this..thank you..