Boiler Pressure

[postie42]

We have a Worcester Greenstar 30i boiler and the pressure guage is now just under the 3 and sometimes goes over 3 when the heating is on.
How do you lower it please?
I tried using the plastic tool supplied under the cover and pushing it up the hole and turning it both ways and the plastic thing next to it but the guage either went up more or water came out.I couldn't get the guage to lower,doesn't seem very straight forward.

[postie42]

Sorted it now,for anyone who might need to know for future reference,all I did was go round and bleed all the rads,and hey it was like opening a bottle of pop that has been shaken up!7 rads in the house and 5 made a right racket I am sure I could of blown my bike tyres up with all the air in them!1 made a banging noise as the air was trying to get out lol.
Mind you when I checked the pressure guage on the boiler it was on 0!!! So I just pushed it up to just over 1 and with the heating on has gone up to just under 2,I guess I put a bit to much back in but its ok from what I have seen on the net.I could always just let some water out of the Rads if need be I know what to do now.Mrs is going to love me the rads are red hot now like they should be

[Scotengineerlad]

Sounds to me like you have a deflated expansion vessel. This is very common. Over time air escapes via schraeder valve ie same as car tyre. When the water in your system heats up it should be expand by roughly 1/2 bar. Your solution will work short term but also you now need inhibiting chemicals to prevent the fresh water corroding your heating. A £30 or£40 job for engineer to repair as you technical would be classed as "working on the appliance which requires gas safe registered individual". All the best with that.