baxi neta tec 28 losing pressure

[smokey67]

hi all

my sis had a new baxi neta tec 28 installed a few weeks ago and it ran fine for 5 or 6 days then started to lose pressure, she topped it up again and was fine again for 4 days and then started dropping pressure again. any ideas what will be causing this?

 

[Barry98]

Any signs of any drips weeps on rads

 

[smokey67]

doesnt look like it, told her to check them and she couldnt c anything. prob is she lives in scotland and am in n ireland so not so easy to pop over and look at it

 

[shaky]

I won't fit these boilers but a mate who fits them for the firm he works for had a fare few expansion vessel faulty so may be worth a look.
Don't seem to here meny great thing said about these new GA range.