i had the same issue with my swc 150 that comes with the atman 2500 pump. I purchased it in the states but the store warrantied the pump for me.
The issue is the pin wheels supplied with the pumps didnt have very good quality control. Some pumps came with huge wheels and the pumps have trouble turning the wheel initially due to the increased resistance. Clipping the need wheel reduced the drag and the pump could then restart on its own. The only problem is the pump could get damaged if was left on after blackout and kept trying to turn the larger wheel. This is what happened to my pump so even the new pin wheel didnt resolve the restart issue.
I have three needle wheels and they are pretty close in size. The one that doesnt work is maybe 2mm bigger than the one that the store told would work for sure.
I would like to see how this skimmer operates under the new Eheim Compact Skimmer pumps or the new Sicce 600 pump.
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