Wondering if anyone can help diagnose a slightly odd, intermittent problem with my compact 80e (not quite sure how old, but perhaps 5 years or so). The system is firing up fine, apparently working OK and is delivering central heating with no problems -- but no hot water. The boiler is seemingly not "sensing" when the tap is on and hot water is needed, so it's just coming through cold. It's been a bit temperamental for the past few weeks, sometimes giving me HW, sometimes not, but now seems to be totally on the blink.
Plumber came and looked at it last week when (ironically enough) it decided to start working again, so wasn't that helpful, but he thought system might need flushing out to clear gunk etc, perhaps there was a blockage somewhere inside, exacerbated by the cold.
Any bright ideas before I start spending money?
thanks Andy