Boiler pressure dropping
For a while now I've noticed the combi boiler (Vailant EcoTec Plus) pressure is dropping 0.1 everyday and the heating has been off for a couple of weeks now.
I have noticed that when I use the hotwater taps I hear bubbling sounds from the boiler. Is this linked?
How do I remove the air? Am i wrong in thinking that it can't be air in the rads because isn't this completely different to hot water for the taps? If there is air in the rads and a bubbling sound when asking for hot water does this mean I have a goosed heat exchanger etc etc? So confused
TIA