The pressure on my combi boiler is sitting between 0 and 1. The heating and water are working ok, although some of them are cool despite me bleeding the radiators. My question is where about is the valve to adjust the pressure. There is nothing to see externally, only copper pipings running to the back of the radiator. Do I have to take down the facing and if so where should I look and what should I look for?
Your pressure setting is ok at that level but only when the boiler is cold. If it is this level when hot then it is too low. Look for a small back tap like handle on the ?water in pipe. If theres not one then look for a small round valve with a slot on it. There should be one. Increase the pressure by turning this as it allows water into the boiler. Just make sure you do it gradually and do not increase it any large amount and make sure it is turned back to the off position when done. I would still advise you allow a qualified person to do this just in case. Anyway, if this doesn't help then you definitely should consult a CORGI Engineer.
