I’ve had the same issue. Customer service wasn’t much help. Due to my inability to provide proof of purchase, all they would tell me was to buy a new impeller. I ordered 2 when they finally came in stock just so I’d have a spare and neither impeller cured the problem. With luck I’ve been able to get the pump working but anytime it stops due to power outages, maintenance, etc; I have a hard time getting it going again.