Hi
The automatic air vent attached to the pump housing is leaking. Now there's supposed to be a bleed nipple screw in the top but there isn't (no idea where it's gone). So I bought a new AAV and just used the screw from the new one and it stopped leaking
However it occurred to me that perhaps I should replace the whole part as the AAV is obviously letting water through when it shouldn't (albeit a very small amount).
Just wanted some advice on diy-ing this job. I was thinking of closing the flow and return isolation valves. There is a magnetic filter on the return so would close the isolation valve there for the return side. Then release water from the magnetic filter to empty the boiler. Then replace the AAV, open the valves and fill her up to pressure
Was wondering if this is the right way to do it? Presumably the Loss of inhibitor would be negligible? Or should I drain the whole system?
Also can I just unscrew the AAV with a wrench?
Thanks