got up friday morning to no heating or water,went to the boiler it was not lit.pressed the reset button and it fired up thought that was it.ten minutes later the mcb tripped in consummer box for the sockets,reset it went back to boiler it smelt a bit of burning.turned the programmer to off and went to work.come home from work turned power back on for boiler but has soon has i slide heating switch to on it just blows the 3amp fuse.checked the condensate trap thats fine(drains into washing machine trap).have tried several times but it just blows fuse every time.had a plumber out yesterday he says its the circuit board and will have to wait till he can get one.has anyone else come across thease symptons and was it the circuit board.