expansion vessel

[gooner1973]

i am having a problem with my central heating and have noticed that my vessel pressure is nearly at 0 and i have tried to refill via the filling loop but it wont refill could it be a faulty vessel any ideas please

 

[kevplumb]

expansion vessel pressure see FAQ at the top //www.diynot.com/forums/viewtopic.php?t=37170 3rd down

system pressure is adjusted with the fill loop

 

[gooner1973]

thanks for that but why wont the expansion vessel refill even when i open up the water in valve on the filling loop the gauge just stays at zero

 

[doitall]

Some have two valves. a pic perhaps.

Could be the gauge is faulty as well.

A tad more info about the boiler and system may help.

 

[kevplumb]

thanks for that but why wont the expansion vessel refill even when i open up the water in valve on the filling loop the gauge just stays at zero

forget expansion vessel

you are to increase the system pressure different animal

if nothing is happening as dia says make sure there are not 2 taps on the loop

can you hear water running when you open the valve

did you check the prv pipe outside

you may have a drain tap left open

boiler isolating valves may be closed

a pic would help as already stated as would boiler make etc

fill loop View media item 11214

 

[gooner1973]

its a seperate expansion vessel not in the boiler
the gauge works as i turned the relief valve and it zeroed out
and im getting water to the vessel but it just wont fill up
and all the pipes around the zone valves are getting warm but im thinking that because there aint enough water in the system thats why i have no central heating

 

[gooner1973]

and my filling loop looks similar to that one just that it has 1 filling tap on it

 

[kevplumb]

how do you know you are getting water into the system

if gauge is showing 1.2 cold theres enough water in the system

if you have opened the prv check it aint leaking

 

[gooner1973]

i have taken the filling loop pipe of and open the filling tap and the water is getting that far but not into the vessel and the gauge still says zero and im not seeing any other leaks??

 

[kevplumb]

the connection at the other end of the loop is blocked then

if you crack the nut on the other valve does any water weep out

 

[doitall]

Why do I get the feeling the OP is trying to fill the expansion vessel with water.

 

[kevplumb]

ts a seperate expansion vessel not in the boiler
the gauge works as i turned the relief valve and it zeroed out

why empty it and why with the prv

 

[doitall]

Have you played with the Schraedor valve on the vessel, and let the air out.

 

[gooner1973]

fitted a new filling loop and job done so thanks to you all for pointing me in the right direction but now i have another problem where 2 of the rads are cold after bleeding and the other 3 are nice and hot any ideas