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glow worm 30ci re pressure????

Got a glow worm 30ci and the pressure has dropped to 0.5 bar. ive tried to raise the pressure by using the correct filling devise but with no joy. it doesnt make any noise wen i open the tap at all. any suggestions?
damo., March 2010
rpz valve gunked up. either replace or fill at a radiator drain valve with a hosepipe

a, November 2010