How to re pressure my Ideal ICOS Boiler?

Good Morning Charles_849 To increase the pressure in your system should be straight forwards although if the pressure has dropped over night or even with in the space of a few weeks I would recommend call a plumber to help find and repair a potential leak in the system. However if the pressure has fallen slowly over a long period of time you can follow the instructions below. I recommend you have someone to watch the pressure gauge below the boiler and shout to you when the pressure rises to between 1 and 1.5 Beside the cylinder in the link below you will see a silver hose with a black 1/4 turn tap. Turn this and you will hear water passing through, confirm with the person watching the pressure gauge that the pressure is rising. Once between 1bar and 1.5bar on the gauge close the tap. https://drive.google.com/open?id=1UHdHR9myqGjftNnohSClwZtOq8XQn_nw Keep an eye on the pressure over the following days to make sure the pressure does not increase to near 3 bar or fall to 0. Remember there will be some movement when the water in the system is either hot or cold, I hope this helps. PS I would also recommend getting someone to make some small alterations. one valve is installed incorrectly (upside down) and I see some cables are showing going into the electric box.