Sealed system boiler pressure increase

18 Dec 2005
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United Kingdom
I have noticed the pressure of our WB 30 cdi boiler increasing over the course of a day or so. I have bled rads upstairs although downstairs is wet UFH.initially I did get some air out and the pressure dropped,then proceeded to fit auto vents to the towel rads throughout the house.The pressure gauge on the front of the boiler shows the pressure has still increased over a period of time.Filling loop is disconnected. Could it be the internal pressure vessel needs its pre charge checking? I also noticed that when the boiler fires up that pressure drops back to around 1.6bar.It doesn't seem to go much over 2 bar yet and I can't get much more air out of the system.
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