I’ve looked through the answers but I’ve not seen a solution to my problem. My pressure gauge drops overnight 1.75 bar to zero. No visible leaks any where …valves..connections pressure release valves etc. All radiators heating correctly and no air in rads. Circulation pump has no sounds of air gushing inside. automatic air vent close bye the boiler working normally no leaks no signs of water releasing. To re pressurise the system it literally takes a quick flick of the filling valve to get to the correct working pressure. Over the last couple of weeks I put two cans of tec7 sealer into the system. But no good. If I leave the circulating pump running without the boiler running the pressure remains constant.
Please does anyone have anything else to try
Please does anyone have anything else to try