Sounds like the problem is with the pump/motor assembly. Could be a broken impeller, bad motor, or foreign objects (broken glass, etc) inside the pump.
Options:
1. Replace the entire
pump/motor assembly (Pros: Easy fix, nothing to figure out, replacing the whole assembly takes less time. Cons: more expensive than separate components)
2. Take the pump apart and see what's causing the problem. Replace the failed component (impeller, etc.)
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Pump/motor breakdown diagrams
Hope this helps. Keep us posted.
