Potterton Puma Pressure Question

[deejay88]

Hi
My boiler is losing water pressure, have to recharge every couple of days.
Today I let out the system water pressure until it read zero on the gauge.
Tested the expansion vessel and almost nothing in it.
Recharged with pump to 1 bar and noticed the boiler water pressure gauge had risen to 1 bar also.
Does this indicate a faulty pressure vessel membrane allowing the air pressure into the water side?
Thanks

 

[Agile]

No, it just shows that you did not follow the correct procedure for repressurising the air in the EXV.

Tony

 

[deejay88]

Ok thanks for that, what did I miss then?

 

[ianmcd]

you MUST leave a drain point open when you re-pressurise the EV as the water that is in there needs somewhere to escape to so you can completely inflate the membrane, there is no other way of doing this

 

[deejay88]

Thanks, makes sense.