I CANNOT GET THE BOILER TO FIRE WHEN CALLING FOR HOT WATER,IT WORKS FINE FOR CENTRAL HEATING WHEN THE ROOM STAT IS CALLING,I HAVE BY-PASSED FAULT BY TURNING ALL RADIATORS OFF AND SETTING THE ROOM STAT TO HIGH AND SETTING THE TIMERS ACCORDINGLY,BUT WOULD LIKE TO RESOLVE PROBLEM CORRECTLY,CAN ANYONE HELP?

STEVE,CHESHUNT, September 2009

This would appear to be a controls fault and not boiler. Suggest that a motorised valve is at fault alongside your hot water cylinder.
What type of valve(s) do you have (2 x 2 port or 1 x 3 port)?

Steve, September 2009