Variable combi pressure

[charlie_parker]

boiler pressurised to 1 bar and holds it steady. Preheat DHW and pressure drops to 0.5 bar. When CH on pressure increases to a max of 2.9 bar. Bolier is Baxi 105e and recommends pressure between 1 and 1.5 bar. I would appreciate views on this problem.

Thankyou

Charlie

 

[ChrisR]

Your pressure vessel / expansion vessel needs pumping up. Lots of posts, do a search.

 

[kevplumb]

1 find big red lump
2 attach pump to same
3 inflate
4 get numbers right drain system first

 

[charlie_parker]

Your pressure vessel / expansion vessel needs pumping up. Lots of posts, do a search.

yes, have done so guessed the vessel needed inflating or replacing. Just hoping it might be something simple, like a faulty guage. Thanks for the response though. I'll get me kit.....