Does it always trip the GFCI or just occasionally? If the impeller is stuck or damaged the pump will overheat and a thermal fuse will cut power, also the coil will draw increasingly more power and act a bit like a capacitor (delay or difference between hot and neutral which is what trips a GFCI) if the impeller does not spin freely. The shaft should be permanently attached to the magnet and it spins in a ceramic bushing with a silicon rubber sleeve at either end. The shaft must not be broken or stuck to the bushings. The bushings should be firmly in their respective sockets.
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