Some background. Went from vented to unvented system 5yrs ago when I added an extension to the house. I have 15 radiators and underfloor heating. Boiler fitted was a Vaillant Ecotec plus 637. It's a 3 port valve system for heating, hot water and underfloor heating. Water cylinder is 290 litres.
Only issue I have left that is has been dragging on for 5yrs is what looks like water hammer when the heating motorised port valve closes when boiler goes into pump over run. So get this regular banging all day long.
I've checked to make sure the direction of the valve is fitted right way (green arrows in 3rd picture below) and it looks ok. Not sure what the issue is. I've attached some pictures of my heating system.
Any help appreciated. Thanks.
Only issue I have left that is has been dragging on for 5yrs is what looks like water hammer when the heating motorised port valve closes when boiler goes into pump over run. So get this regular banging all day long.
I've checked to make sure the direction of the valve is fitted right way (green arrows in 3rd picture below) and it looks ok. Not sure what the issue is. I've attached some pictures of my heating system.
Any help appreciated. Thanks.