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Grundfos noisy

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davidj.vincent@

I have a noisy Grundfos central heating pump. It rattles sometimes.
If I undo the big screw in the middle of the pump, there is the sound of a puff of air, (in or out, I don't know) and then on restart the pump is quiet, for a while---then it starts rattling again!
How do I fix this please?:confused:
 
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