How Can I Reduce Pressure In My Ch System?

[peripathetic]

I have recently had installed a condensing combination boiler.
Initially with the boiler switched off and cold the pressure was just below 1 bar rising to 2.5 bar when hot.
Now when cold (but on overnight boiler frost protection) the pressure is 2.5 rising to 3/3.5 bar when hot and the pressure relief valve is activated.
Is there and easy way for me to reduce the system to the original recommended
pressures?

[buildersmate]

The easy way that you crave is to let a little water out of a radiator using one of those tap thingies.

However you need to investiaget why the pressure is increasing - that can't happen unless water is getting into the primary system somewhere it shouldn't be.

[heathfield]

(For the uninitiated - BM's 'tap thingie' = radiator bleed key.)

[buildersmate]

memo to self: must remember to cater for the uninitiated in future

[pilotlight]

peri, As your boiler has been installed recently, the 'easy' way to sort your problem is to get your installer back. The problem should not be occurring, simple as that.
Hope this helps.

[peripathetic]

Thank you to "Buildersmate", "Heathfield" and "Pilotlight" for your help. Cannot choose a best answer as each has its merits.