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I don't know, how could I tell...? When the taps are on, the heater seems to "fire up" at it were. but switching the central heating makes no difference to the noise it makes. (If thats how you tell) Thanks, John

A Friend of mine has a problem with her heating system. The hot water works fine, however the heating does not. It's a celtic FF combination boiler, honeywell timer. On first inspection the pressure in the system was 0. I figured out how to get the pressure up, via a tap underneath the...