Hi - my Baxi 105e have been running on low pressure for a long time and I need to let some new water into the system to bring it up to the correct operating pressure.  Under the boiler is a flexible hose and I read that I need to open taps on either end to let water into the system.. I can turn one and a little water drips out, but the other one won't budge (don't want to force anything for fear of crashing the system !).  The boiler, heating and water are all working fine, except the boiler hums constantly and also 1 rad does not get warm to the top - tried bleeding but nothing comes out.  I am beginning to assume that all the issues may be related to the low pressure.  So if I could get some water into the system, I could see if anything else still needs checking out by calling in an expert.

Really grateful for some advice on how to get water into the system.  Thanks