slowly losing pressure in central heating - bellway home

[ttpsm2]

I have had my house for about a year now, i noticed my central heating pressure gauge was 0.5 bar the other day when the heating was off (not had the central heating on since) when i know it was 1.8 bar at some point last year. So i topped it up to about 1.9bar. not used central heating since and today i look and it is 1.3-1.4 bar about 5 days later, is this normal? if im not using the central heating at all and i top it up and then the pressure falls does it mean there is a leak in the house??

its one of these dual pressure systems with the boiler in the kitchin and a filling loop on the 3rd floor with the rest of the water system, dont think it is a combi bolier though.... the heat is transferred somehow to the central heating in the airing cuboard on the 3rd floor

 

[Armo74]

You should really consult the manufactures instructions for the correct pressure. 1.2 bar is the norm when the system is cold.

A slight rise in system pressure is perfectly normal when the heating is on as the water expands.

 

[ttpsm2]

so its possible the system has self regulated to remove the extra pressure i added?

 

[ttpsm2]

i have a range tribune HE unvented hot water cylinders, it mentions something about

"tribune he operates 3 bar(controlled by the inletcontrol set) and is capable of delivering over 50l a minute"

also mentions something about in a domestic installation 1.5bar should be regarded as minimum.

i can only see a pic of the white expansion vessel in the instruction manual and not the red one that has the pressure indicator on it that i believe is the one connected to my heating system

confused :S

 

[ttpsm2]

my boiler is a LOGIC Heat 12

 

[ttpsm2]

incoming static cold water pressure at inlet to PRV is 2 bar

PRV set to 3 bar

 

[Crezzer]

The pressure for the radiators is not connected to the mains water pressure, if you top it up and it then drops then you either have a leak somewhere or the expanssion vessel (red one) is knackered or the prv on the heating is letting by.

 

[ttpsm2]

Is there any possible scenario that means I don't need to worry that there is water leaking behind walls and causing loads of damage? Do I need to call someone out?