atag boiler over pressure issue

how to correctly top up and reduce pressure on the domestic atag boiler range .

[@SmithOben]

Howmany bar is it supposed to have?

[@halhilou02]

I thought you're not supposed to use the PRV to reduce system pressure? I've been told that turning them messes up their calibration?

[@timeintheuk]

Not going to upset the calibration . however there's a chance it will need replacing .there no drain off on atags only the prv

[@pauldarko5182]

My stag boiler doesn’t have that red tap. To release pressure. I have a black tap near the gauge

[@timeintheuk]

Yours could be an A series ?
What's the model number

[@thetimebombardier]

When i saw the vid title i thought for a second it was a heuer boiler 😅😅

[@timeintheuk]

No such luck

[@Sparkleswood]

What are you doing to relieve the pressure?

[@timeintheuk]

​@@Sparkleswood you could vent the radiators .

[@SmithOben]

Howmany bar is it supposed to have?

[@timeintheuk]

1.1 to 1.5