AO Smith
Cavitation or Debris in Impeller
AO Smith pool pump makes a loud rattling or grinding noise from the wet end when running.
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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
Pump running with insufficient water (starved suction), Blocked suction line, Air leaks causing cavitation, Hard debris (stones) in impeller
How to Fix / Troubleshooting
Safety First: Turn OFF power before opening the pump or valves.
- Check water supply: Ensure pool water level is adequate and all suction valves are fully open.
- Eliminate air leaks: Inspect and correct any suction-side air leaks at the lid, unions, or fittings.
- Inspect impeller: Disassemble the pump housing and inspect the impeller for stones or hard debris. Remove any foreign objects.
- Restore proper priming: Prime the pump fully before restarting to avoid cavitation damage.
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Repair Difficulty
Medium
3/5
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