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Thanks Gentlemen for all your help. You have given me various options which I’ll need to consider. I think I’ll get the stat looked at first, as I have already drain the system. :) J

Thanks for that information :D . So I have drained the system twice (leaving about 12 hours between) and added Fernox. hopfully this will stop the boiler from "overheating".

Thanks for the reply, but I’m not sure I understand the linkage between orange water and over pumping. I’ve the check the level in the header tank and this seems fine, and the pump was set to its lowest flow rate. :? J

Thanks for the replies gentlemen. Just one other thing to add is that the header/expansion tanks get hot while the system is running and the overflow from the header tanks seem to drip while the system is running. Would this lead you to believe the boiler is getting too hot? :? J

Well, The hot water is not scalding, and the radiators are not dangerously hot. I have checked for air and bled the system all seems fine there. I was told by someone that the system may need to be pressure cleaned, but on draining the system the water appeared to go from clear to orange and...

Hi, The problem I seem to have with my boiler is that after a couple for hours (any thing between 2 to 6 hours) the boiler will overheat and shut down. When reset the boiler will work fine – both hot water and central heating appear to be fine while the boiler is working. The boiler is an...