our boiler has developed a personality of it's own. It manages the central heating fine, but occasionally cuts out when drawing hot water. Light goes out, water goes cold, followed by rapid flashing. Turn off power 5 mins turn back on, works. We've had a plumber round who's replaced the fan and the air pressure switch but that hasn't solved it - but now boiler will work fine when the plumber comes and then cuts out randomly (often timing it right in the middle of taking shower!) at other times.
Any suggestions what this could be?
Any suggestions what this could be?
