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When i try to fill the heating system, then the pressure gauge doesnt increase. It stays at 1 bar, or just below. I can continue adding water until a release valve on the back starts to emit water.

No debris.was serviced a couple of months ago.

Hi. I have a gas fired 333 F and I emptied the sytem to remove/flush all the radiators. I re-filled the water tank using the coding 02F:2. The pressure gauge did increase a bit but only to 1 bar. After firing up the system, it eventually increased to 2 bar. After a couple of weeks suddenly went...