Forum » Koralia Magnum 5 - vibration mostly at night

Hi, I have had a Koralia Magnum 5 for 3 weeks. At night, the unit starts groaning and vibrating, quite sporadically and not consistently. About every 30 minutes for 4 or 5 seconds. Strangely, it does not do this during the day. I can see the impeller is stopping and starting again. I have checked my installation, and nothing appears wrong with the unit and the unit is clean of blockages. Do you have any suggestions? (At the moment the bearings case has the white top facing out with the 3 crosses in it - maybe this should point inwards?) I appreciate any help you can give as this has me baffled. Jeff

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