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    Noisy condensing boiler when firing up.

    I have a Ravenheat CSI primary, fanned flue boiler (12 months old) 9 radiators fitted with Rad valves. Manual bypass, cracked just open, (if I open too much, rads don't get very hot) System was power-flushed at installation and has inhibitor in the system. Pump running on setting 3, have...
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