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John, Thanks again thats really helpful. I will check the pump and EV later. I did see that other post about air ingress but disregarded it as I have a magnaclean. However, I will check it - It did come with spare O Rings….maybe time to replace them just in case…

Hi, yes define only ever venting with the whole system off. Not sure how to tell if the pump is on the boiler flow? No, there’s no plastic piping- the entire system is copper pipe work. I will check the glands on the pump tomorrow but the pump runs totally silent, never heard any trace of air...

Yup, borrowed a Hydrogen specific meter from work and got nothing….vented this afternoon and tried lighting it…again nothing. Im just at a total loss……

It was only fitted around 6 months ago - my problems exist before and after fitting. The system holds pressure - the only time pressure is lost is when I vent the system - I then have to refill it.

Thanks Mottie…. Im sure that would help, but my focus at the moment is to try and figure out why and how the air is getting in…there just seems to be so much every few days that I feel theres a fundamental issue somewhere!

Hi John, thank you for taking the time to reply. Yeah, have checked the EV several times, always water, never air from it. Yes, every time I vent all of the air from the radiators, I basically lose all pressure in the system, as I vent off so much air and water. I use a 500ml jug when venting...

Hi All. I know this is a popular discussion topic....Ive reads lots of threads on it but can't find the answer to my issues. We live in a 3 bedroom bungalow. I had an old Potterton gas boiler open vented system. This was located in the loft along with the pump and head tank. There are 7...