I have a microgenius combi boiler. A couple of days ago my bath and shower water temp dropped and both were lukewarm at best.British gas came to do my annual homecare check yesterdayand when the guy left the wtaer temp was fine. Today, however, the boiler doesn't seem to be igniting and of course my water is freezing cold. What are the possible reasons for the flame not coming on?

Charlie, August 2010