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Hello, Usually the water pressure is around 1.5 bar. But this weekend I was away and my flatmate told me that the boiler stopped working and that the boiler showed "error F" that means water pressure below 1. So I told her how to put it back at 1.5 by opening the 2 valve blue and black...

Hello, Ok, so my logic combo was working fine since today where it displays alternatively F and 1. I have looked the manual and it says that the water pressure is too low and that it should be between 1 and 1.5 bar and that I have to fill and vent the system. I have no idea what fill...