Baxi 105e Losing Pressure Within a Day or 2

[Ninja_1980]

This is the 3rd in the series of the problems in my “new” house.

I have a Baxi 105e combi boiler system. When I 1st moved in the pressure when the unit was turned off was 0bar, and when on, 0.5bar. I have topped up the system so it sits at 1.0bar when off but shoots up to 2.0bar when operating

The problem is every time I do this the pressure goes down to the previous value within a couple of days. I have tried placing a bag over the PCV overflow and it didn’t show any signs of leaking.

Also, the very 1st time I topped up the system to 1.0bar when switched off, the working pressure shot up to 2.0bar. At this point I switched off and drained some liquid from the system. I mixture of air and water seemed to come out and then the system seemed fine.

Any advice would be appreciated

 

[namsag]

Tiny leak somewhere check all the rad valves, nothing up with it going from 1 to 2 bar while on this can be down to the amount of rads on circuit or pressure vessel needing recharged slightly

 

[baxpoti]

Are you bleeding the radiators?