Hi I have Keston Boiler with a pressurised central heating system. After i've installed recently 5 TRV my system looses pressure ~0.4 Bar/week and it is obvious that the system is sucking air from somewhere. I think that I have a micro-leak in my system but I can't find it where it is exactly. There are no obvious leakages. Any idea how to fix that?
Thansk in advance
Thansk in advance