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ferolli combi?

Hell of a vigrating noise through the pipes when heating kicks in. Switch off heating got no hot water. Switch back to heating and the water is scolding hot rads warm up ok but it is now alarming the boiler and shutting down. Any ideas
Steve Jenkins, May 2007
Modena 80e and yes the pump is running

Steve, May 2007
Which ferrolli ?

T.h.s, May 2007
is the pump running ?

hi-spec plumbing, May 2007