Pressure on worcester 24CDi when running

[chesterman]

Been reading through lots of threads concerning these combis but cant find any answer to what I am looking for.
I have always had it set at just over 1 bar when its standing , but today I had to bleed the rads and then went to top it up as the pressure had dropped.
As I was topping up my hand slipped of the valve and it went up to nearly 3 bar and so i used the relief valve to bring it back down to just above 1 bar.
Now what should it run at when the central heating is switch on as it is going as high as 3 bar, is this right.

Never really noticed it going as high as this before but could that be down to the fact one of the rads let off a lot of air.

many thanks

 

[BlueMoonMole]

Your expansion vessel needs repressurising.

 

[chesterman]

thanks for the swift answer bluemoon, but how do I go about that, bit of a novice here.

 

[chesterman]

ok so I use a bike pump .. do I pump and watch the gauge on boiler to 1bar or is there any way of knowing how much I air I need to pump in.

cheers