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Quick update, the valve moves when the motor is switched between CH and HW but still makes a clicking noise. THe arm which controls Auto and Man does not appear to do anything. If I hold the arm to the Man setting then the clicking stops. When I let go, it starts up again. Is it a case of...

Thank you. I will take a look at this. Is it fairly obvious to see? i.e moving valves?

Hello I have what I believe is a Honeywell V4073A valve fitted to my CH and HW system. Just recently it has started to make a clicking noise, approx every 1-2 seconds. I have also noticed that when the CH and HW switch on, the heating runs at max and is not regulated by the thermostat. If I...