What should I do if my UPS3 pump is blocked?
To deblock the shaft, switch off the power supply and close the valves. Use a star screwdriver with a size 2 Phillips tip to push the deblocking screw inwards until it can be turned counterclockwise, indicating that the shaft has been successfully deblocked. Switch on the power supply afterward.
From the official Grundfos Ups3 15 50 65 manual, page 17
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