boiler losing preasure from overflow

[jamesb270]

Hi can anyone help i have a ferroli modena 80e and the overflow
wont stop dripping untill there is no pressure left even when there is no
ch or hw on

thanks

 

[glasgowgas]

re charge your expansion vessel

see FAQs at top of page

or PRV is passing

or filling loop is passing

 

[jamesb270]

can i recharge the expansion vessel myself or is this a pro job ?

 

[glasgowgas]

yep ye sure can, it will tell you how in your boilers manual

after re looking at yer post, i think your Pressure Relief Valve is passing (bit of grit under seat) again replacement is diyable

fill boiler and system to 1.5 bar, disconnect filling loop

if no ch or hw demand and its running out the PRV relief pipe then PRV is funked

 

[jamesb270]

cant find anything under prv in manual would it go by any other name?

 

[glasgowgas]

pressure relief valve

safety valve

pressure release valve

take off front cover, its round about the pump, got a little red twist cap on it.

you can get em from Heatspares, Curzons, Plumbcentre, Partscentre

or maybe somebody could post up a pic from manual??


page 28 fig 39

 

[bengasman]

If this is the boiler I think it is, the prv is part of a manifold, bottom left. About a hundred squid.

 

[glasgowgas]

View media item 15534
so it on line £51 plus vat

 

[jamesb270]

i know where it is now thanks for all your help.

 

[BingoBongo]

they can be a pain to change.

slacken the cold and hot jam nuts and that gives you a lot of play.

got em down to 20mins ive done that many

 

[bengasman]

View media item 15534
so it on line £51 plus vat

I think I got it a few years ago from dumbcentre, £85 + vat if memory serves.

 

[ROSSGR]

Feck!!
Why not change the PRV head??? instead of the complete valve

 

[bengasman]

f**k!!
Why not change the PRV head??? instead of the complete valve

Koz it ain't a standard one, and I don't think you can get the insert on its own.