losing pressure

[cooke1971]

hi all main combi 30he keeps losing pressure bled rads no air no leaks and pressure relief ok any ideas please

[M.Joshi]

Check that all the radiator valves are tight and that there are no leaks.

Failing that, you may have a leaking pipe somewhere.

How often do you need to re-pressurise the system?

[temps]

Hi
Could also be faulty pressure vessel perished or pressure relief valve letting by. Check outlet pipeif leaking then it will be one of these faults.