Releif pressure value Leaking

[kaharrison9]

Hi All
Hoping for some general imput so can understand the problem clearer when the fitters bob round to look at my Worcester 28cdi rsf
6 weeks ago when the boiler came on and the pressure reached around 3 water would start dripping from the relief pipe connected to the RPV.
When the boiler was turned off and cooled we'd top the water pressure back up.
Now the water when we top up the boiler floods out so not possible to use the boiler at all.
Chatting with a plumber he mentioned a new rpv would be needed and the pressure vessell been pumped with a normal pump to repressure the vessell.
Does it sound as simple as that or is it likely the pressure vessll needs replacing.
Looked at the pressure vessell value and when pressed no air came out.
Thanks for any thoughts
Cheers
Kev

 

[Puddle]

its as your plumber says,prime expansion vessel,fit new p/r valve if required,sounds like you are in good hands

 

[kaharrison9]

Thanks Puddle
Is it air in these chambers or nitrogen
Cheers

 

[Puddle]

Thanks Puddle
Is it air in these chambers or nitrogen
Cheers

just air,so 78 % nitrogen by default

 

[kaharrison9]

Cheers Pal
Have a good night

 

[WHPES]

If it's the valve then a new Schrader valve (from car garage) is easier and cheaper than replacing the entire expansion vessel.