Hi I have a ideal logic 35 combi boiler is just little over 4 years old in a new build property was great for first few years but since about 2 years maybe it keeps loosing pressure what I top up. Once it lost it but then the filling loop wouldn't fill back up had someone out they said it may be the pressure gauge sorted and fitted but still it lost pressure every couple months till 4 days ago where now it's every day I'm having to refill and more so yesterday about 5 times maybe more I had to fill I did have someone out again he said it may be the balloon or what that is that needs replacing he said he blew it back up and then went was only here what 15 mins if that soon as he went guess what yep the pressure went so back out he came and said sounds like deffo that part my heating just kicked in and pressure mostly gone again today. There's no visible leaks on walls or radiator my pipes go into the wall not floor and no visable water damage on walls or ceilings so no idea does anyone know what it could be th gas engineer didn't stay long so I don't think it was looked at properly. There is also now air in the system as radiator banged earlier when heating did kick in plus IV had to let air out of radiators last year due to air lock etc help please EDIT also in the summer weeks the boiler was just on hot water from june-sept and it still lost pressure just not as fast as the past 4 days
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