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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
Heating, Home Heating Systems
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Mend Heating, Home Heating Systems

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Find out how to mend home heating systems