Glow worm 30ci combi boiler pressure too high

[Scoop1980]

Hey there folks - quick question if anyone can help.

Our boiler pressure was sitting at 0.4 last night after bleeding the radiators. After releasing the blue tap underneath to help increase the pressure, I tightened it as the pressure reached 1.2

However, it has since risen to 2.9 and there is a rattling noise coming from the pipes as water gushes out of the overflow pipe.

What should (or can) I do to reduce the pressure? I've tried bleeding the radiators again to no avail and have no idea what else to do.

Any help would be greatly appreciated.

Scoop

 

[kevplumb]

the filler ain't closed properly by the sound of it

or you have snapped the crappy plastic thing off

 

[Scoop1980]

Where can I find the filler? Is that the blue tap I mentioned?

As you can tell, technical jargon isn't my thing!

 

[kevplumb]

Where can I find the filler? Is that the blue tap I mentioned?

yes