Cold water combination valve leaking- replace it all?

[braddersads]

Hi,

I've found the culprit to the pressure dropping in my unvented system. Its a dripping cold water combination valve. I unscrewed the pipe exiting it and found the leak, so its definitely that. I also recharged the expansion vessel anyway.

I've had the plumber out and now know how damn expensive these things are. He's said £190 to replace which seems fair as the part is so expensive. I was wondering if he needs to replace the pressure reducing cartridge and line strainer as well as the expansion relief valve?

Its an Ariston Classico 125 cylinder if that makes a difference.

Thanks

 

[petertheplumber12]

I will only comment on the recharging of the vessel. You do know that has to be done while the system is completely de pressurised by turning of water supply and draining until no pressure at all?

 

[braddersads]

Thanks Peter. Yep. Drained it till the gauge read zero.