ok well i wired the boiler to the main fuesd box with a spur but every time i turn the spur on it flicks the cut of switch. i went back and checks all the wires and thery are in the right way red to l black to n and green to e but it still cuts off i then wired it stright to the main fuse box with out the spur but still cuts off any help would be good thanks

if it helps
its a Greenstar 28i junior
thanks