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could the expansion vessal be the cause of the drop in the pressure in the CH system and is there any way to check ?. the pressure drops around 1 bar in around 10 minutes when the system is on.

if anyone can help with my problem it would be greatly appreciated. i have a baxi combi instant 80 he, sometimes it works, heating hw etc and sometimes it doesn't. the diognostics board shows that the problem appears to be the HW sensor. could this really be the root of the problem and how would...