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Pump Noise on Central Heating Shut Down

Joined
17 Mar 2016
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Hi

Googled this as much as i can, but not found an answer. Also posted to grundfloss support, but did not receive an answer either.

So I fitted a Alpha2 Pump to replace my old pump who's bearings were going and making a hell of a noise and it was nice and silent with the added benefit of reduced electricity usage. Then added a Addy Magna Clean to protect the pump. The only place i could add it was directly infront of the pump. Everything was fine initially, however Ive noticed that when the heating switches off I get a ratt-a-tat-tat noise like a machine gun. I've cleaned the filter which had some magnatite on it and the noise went away for a while but has returned. Tank in the loft is not clean so i suspect there is a lot of magnatite floating around still and I suspect that the filter is getting gunked up.

Anyone know if the pump has a slippage clutch that would cause the noise in the event of it being driven on buy inertia in the water built up in the magnaclean?

ideas/thoughts?

Regards

D
 
Does your boiler have pump overrun? And if so, do you have a system bypass?
 

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