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:lol: Just thought i'd post a final reply, I sorted it out myself a couple of weeks ago. It was the turbine (flow switch) on the cold water inlet!

yes the boiler does light so it is warming the water up slightly on the hw system but fully on the ch system

Hi, thanks for the reply. I tried that, when a tap is turned on there are clicks and whiring noises coming from the boiler (with the ch off) it just doesn't get hot (just warm) with the rotory switch at maximum. The ch however get nice and toasty.

Hi I have a 28si II that was installed 14 months ago and has suddenly become unreliable on the hot water side. The central heating seams to work fine but the hw starts hot for 5 secs then turns mildly warm and stays like this indefinetely, is there a valve that controls the water temp? could...