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potterton kingfisher?

loud knocking noise when boiler is running
robert leishman, October 2008
almost certainly the central heating pump has failed. if the boiler runs for a few minutes quietly when cold, then starts banging its nuts off when it gets hot, sounding like a kettle that cannot switch off, then the pump is not circulating.

mark, October 2008
Generally casting sand and system sediment laying in bottom of water section

a, October 2008
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