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Thanks all for the suggestions denso13 and picasso. I seem to have fixed this I got a 470nF 500V AC Capacitor (RG25C from Maplin) and put it across the Orange and Blue wire of the V4073A HoneyWell Mid Point Valve. I understand that the capacitor gives a return path to get rid of a...

I have a Worcester 24Ri it starts up OK switches on the Hot Water and the Central Heating. However, when it switches off the boiler starts clicking in and out a relay. If you switch on and off the Hot Water then it behaves correctly with no clicking. If you do just the Central Heating then you...