Boiler filling loop not working

[andrea.reon]

Hi all,
I have an Electromax boiler (Heatrae Sadia), and I'm having a pressure issue.
The pressure is near to 0.8, I know that it should be about 1.5.
The filling loop was already connected, so my understanding is that opening both the black valves at the end of the filling loop the pressure should start going up. But when I open the valves nothing change (no noise of water or anything).

This is a photo of the system:
P_20180402_094153_vHDR_On.jpg

The handle at the bottom (I think it's the cold water) is turned on (P_20180402_133443_vHDR_On.jpg)

And the screw next to the filling loop right valve is vertically aligned (P_20180402_133027_vHDR_On.jpg)

I also tried to move the screw horizontally, and to move the white plastic lever, but nothing.

Any idea? How can I bring back the pressure to 1.5?

 

[townfanjon]

When you turn the levers look very closely are they opening the valve underneath, in other words if the plastic valves are worn it will give you the impression they are moving , have a look and report back

 

[andrea.reon]

Thanks for replying! Yes, the black levers are working correctly (I tried to connect just one end of the loop and open the lever and water come through on both sides).

 

[rpm]

See it`s working again now @0.9 bar pressure.

 

[SimonG]

Holy chit. That's RAF.