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Why does my boiler keep losing pressure over night and the overflow pipe leaks periodically. I have thermostatic radiators values on all the rads execpt one.

My recently acquired two story flat came with a Glow worm 24ci combination boiler which keeps losing water pressure daily. Sometimes I cannot even get the pressure upto 0.5 bar. I called a boiler man who said that I should either replace the expansion vessel (recently recharged by him) or...