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Halstead Hero 75 ?

My boiler sounds like somebody is banging the pipes with a spanner. I have drained the system and refilled bleeding all the rads but the problem is still there. Is there something else i have to bleed in the boiler itself?
Mr Wright, November 2009
have you checked that the pump has voltage to it and is running, if yes then you have a blockage in your system

fred west, November 2009
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