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The boiler is a Baxi Solo. I've managed to find a manual on the "net", I believe that the main thermostat could be the source of the fault. What do you think?
Thanks for your reply.
My central heating system works fine except that when the heating or hot water is switched off by the programmer the pump continues to run constantly. I have replaced programmer and 3 port valve without any improvement. I guess that the pump should run for a number of minutes after the system...