i have been experiencing some problems with my boiler and whilst surfing the net to find any related problems, with this type of boiler,happened to stumble upon this website, and so decided to join.my problems are i believe 3 way valve related,in that i get heat from rads when running hot water tap.my other problems are, boiler will not fire up but pilot light is on (intermittent, does not happen all the time, pump and fan are heard to run,i can get the boiler to fire by tapping one of the microswitches on pcb),and when ch is on boiler will shut down after 5/10 mins but pilot remains lit. i hope that someone out there can give me advise,many thanks.....