see if thers 240v between main live & neut into boiler..if not check 3 amp fuse in spur/plug is ok...if the powers ther you can reset the board on the 105 by turning the selector switch to reset position and holding ther for 10-15 seconds..if thers no joy ther bud your pcb has had it...bad times lol
toke
September 2009
is there power going to the boiler?
Ian
September 2009
the pcb board seems to be blown or the fuse in the fuse spur has blown