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Thanks Pete. I was coming to that conclusion too but after the good talking to I gave it yesterday, it now seems to be behaving itself! Will give it one more chance! :)

My central heating system has three 2 port valves. One for water and one for each heating zone. HZ2 is a 15mm two pipe system. HZ1 is the original single pipe 3/4 inch system with cast iron rads. All valves move correctly and all the programmers and thermostats seem in order. However when...