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Once CH gets hot a terrible shuddering, banging, noise, like very heavy drilling vibration occurs. It is resonating to such an extent it seems to be all around and it is very difficult to be confident about where it stems from. The expansion vessel has been changed. The pressure gauge is on...

Vokera Syntesi 25e CH heats up OK but after 40-60 minutes all hell lets loose. There is a terrible shuddering, banging, noise like very heavy drilling vibration. It is resonating to such an extent it seems to be all around and it is very difficult to be confident about where it stems from. It...