External to your boiler, situated below it and set back, will be 5 pipes which give gas, water etc to allow the boiler to function.
On one pipe will be a small black plastic tap, which allows water into the system to increase pressure.
On the main boiler panel which shows if the heating is on and where the ON, OFF, RESET switch is, there will be a dial to the right which is your pressure gauge. The word BAR should be in the middle of the dial.
Simply turn on the black tap mentioned before (only needs half a turn, its not like sink tap) and the needle on the pressure dial should go up from where it is (I assume it is below 1 right now). It may take about ten seconds for the needle to get to the number 2. When it is here turn the tap off and you should have normal pressure again. It doesnt need to go past the number 2 to operate so make sure you turn the tap off when it gets to there.
Regards
Phil
Phil Hardaker, December 2006