Pentair Partial Seizure / Rotor Lock or Low Voltage Stall

Pump is unusually loud with a low humming sound but does not move water effectively.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Debris jammed in impeller, Failing bearings, Undervoltage preventing full startup torque, Internal drive fault limiting output

How to Fix / Troubleshooting

Safety first: Turn off power before opening the pump or touching the motor.

  • Step 1 – Check for obstructions: Remove pump lid and basket, then inspect and clear the impeller of debris.
  • Step 2 – Verify voltage: Have an electrician confirm correct voltage at the pump during startup.
  • Step 3 – Test shaft rotation: With power OFF, rotate the shaft by hand. If stiff, bearings may be failing and the motor/drive should be replaced.
  • Step 4 – Replace motor/drive if needed: If voltage is correct and impeller is clear but the pump only hums, the drive or motor windings are likely damaged.
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Repair Difficulty

Hard 4/5

Required Part

IntelliFlo Motor and Drive Assembly
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