Recent content by Birdbrainuk

Valve is a honeywell 40003916-003 Power head for motorized valve Hope this is what you wanted

The central heating system heats fine but if only the water is on When it goes off the system bangs and the heating/water change over valve rattles this can all last for a minute or so. If the heating is on then this does not happen. I guess there is air in the system but what is the best way...