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Cyclical noise pattern from Grundfos Alpha2

Discuss Cyclical noise pattern from Grundfos Alpha2 in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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mhomami

My Grundfos pump keeps making these rattling/bubbling noises in 2 minute cycles. 2 mins of noise, 30 secs of perfect silence, then 2 mins of noise again. It runs at 16w initially and then drops to 15w steady thereafter on setting 2.

Is it pushing sediments/air through the system and it takes 2.5 mins to go around a full loop or is it something more sinister?

I have a video of the noise but will not be able to link as I'm a new member. Please let me know if you would like me to pm it. Plumber will be in on Saturday to inspect, would be grateful for advice so I can talk to him about the problem.
 
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