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home Fix label Heating label_important Home Heating Systems category Ferroli

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
home Fix label Heating label_important Home Heating Systems category Ferroli
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