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Mend Ferroli Optimax HE Plus 35 S Heating Noise Pressure

what is the problem?

i have a ferolli optimax he plus 35 s. When the heating is on there is a loud humming noise in the pipes a reading on the display says d2 and the pressure drops now and then. what could be causing these problems ?

chris
December 2010

Ferroli Ferroli Optimax HE Plus 35 S Heating, Home Heating Systems Heating Noise Pressure

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Ferroli Optimax 35S: Humming, D2 Error & Pressure Drop