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Thanks for help Stem, sorry to be a little dumb (as I am only a lowly electrician and not a plumber) and I do not understand fully how my system works, as I said earlier I have a combi connected to an unvented Santon hot water cylinder which has 2 x 2 port valves and thermostats fitted. So my...

Hello Everyone, Apologies if this question has been asked before, a while ago I had an old system boiler replaced with a combi boiler that is connected to a Santon PP170b cylinder, when the conversion was done old 2 channel programmer was retained but this has recently failed. My question is...