hi there, i have a myson orion boiler,its quite old, anyway my problem is this, weve only had hot water on over the summer and its been fine, now its a bit colder weve put the heating side on as well, it seemed to be working ok, rads were getting hot, then after about 15 mins it tripped the electric, ive tried it a couple more times an it does the same thing, any ideas? thanks