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have followed service manual instructions to the word .when u say sytem open does that include draining all rads.

I have a worcester bosch highflow 400 combi.running pressure is generally around 2 bar.when system is off the pressure on the heatbank gauge is barely registering. is this ok. i have checked expansion vessel pressure and set to 0.5 bar as designated. not my specialist subject so would b really...

I am looking for some expert advice on my worcester bosch floor standing boiler.when heating is up and running the pressure is steady at 1.5 bar,but when i switch off it drops to 0.I have been told this may be a problem with the expansion vessel.no water is present in vessel.is it safe for me...