my vokera was leaking from the pipe connections to the heat excahnger . they just needed tightning. Is there water under the gas burners. Where is the leak is the most important question?
David Pearson, December 2010
either the filler loop is open and the pressure is above 3 bar or the expansion vessel needs pressurization if its coming from the safety valve .or worst case heat exchanger is leaking and needs to be replaced
