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hi Rick, thanks for chatting. I have 2 issues with a Sime combi boiler. Issue 1:the central heating cuts out / doesn't work. The 3.5 bar pressure LED is lit (red). If I turn on nay cold water tap in the house the pressure drops to 2.5 bar and the central heating starts working!Thanks for your help. Tony. Sorry forgot to say the second issue,which may be related, is that the hot water has a brown look to it. Cold water is clear. Cheers Tony