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Thanks for all your help, much appreciated. The boiler has a bypass circuit included and there is a also a short pipe from the pump with a valve on it going to the return from the cylinder. I have also taken the Ikon valve apart and cleaned the switch. Everything seems to be working ok at...

The valves have a position indicator - A for closed and B for open. the one with the faulty switch returns to A - valve closed when cylinder stat reaches temp.

Ok thanks for the quick response. The head is detachable, I'll visit my local Travis Perkins for a replacement. It doesn't stick every time and when it does a gentle tap on the cover opens the microswitch. Just a thought. When the switch sticks and both valves are closed the pump and boiler...

I have two port valves controlling water and heating. One of the valves (water) when closed is still sending a live to the boiler and pump. The micro switch must be sticking. I noticed that the orange wires are connected to permanent live and the grey wires to boiler/pump. According to the...