Vaillant EcoTec Pro 28: F.22 warning (low pressure), but no filling loop

[CBW]

Should I turn both taps?

Yes, both taps, time approx 15 seconds, then go and check the boiler pressure, it should be above the first set of dotted lines. If you’re struggling to see them, press any of the 4 buttons grouped together on the display to wake up the display.

 

[BlueLoo]

Great place to put it, How on earth can you see the system pressure from there?

 

[AmirMoosavi]

Yes, both taps, time approx 15 seconds, then go and check the boiler pressure, it should be above the first set of dotted lines. If you’re struggling to see them, press any of the 4 buttons grouped together on the display to wake up the display.

Amazing, it works now, thank you!!! It did shoot up to 3.1 bar within 15 seconds, so I will turn the boiler off for a bit to lower the pressure.

 

[CBW]

Sounds like you’re mains pressure is powerful, or you have an expansion issue, probably the latter. I would drain some water from the boiler valve or a radiator, 3.1 bar is far too high.

 

[AmirMoosavi]

Sounds like you’re mains pressure is powerful, or you have an expansion issue, probably the latter. I would drain some water from the boiler valve or a radiator, 3.1 bar is far too high.

Yeah, I've bled 3 of my radiators for a bit, will turn the boiler back on in an hour and then bleed some more if it's still too high, thanks again