Hello all. recently bought a secondhand dual fuel cooker. Range Master Leisure.. Serial No. 5407003589. When it was first put in it worked fine. Then the following day, when the fan oven was switched on it would trip out. Got in touch with guy we bought cooker from and he said he never had problems. And that maybe our fuse box wasnt up to handling the cooker? I got in touch with the company of the cooker and was told most likely the fan oven element needed replacing. I bought new element, fitted this myself and hey presto, the cooker oven worked!!!! and worked for afew days...... Then last night went to cook dinner, soon as oven was turned on the thing tripped again. Left cooker off all night tried again today and same thing happened. Can aynone please tell me what the heck is going on? and what needsto be done to rectify this. Any advice would be most appreciated.