AO Smith
Low-Speed Circuit Failure
AO Smith two-speed pool pump will only run on high speed; low speed does not work.
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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
Failed low-speed winding in motor, Faulty two-speed switch or relay, Miswired speed selector, Open low-speed capacitor (if used)
How to Fix / Troubleshooting
Safety First: Turn OFF power before accessing wiring or switches.
- Check external switch: Inspect the two-speed toggle switch or automation relay controlling the AO Smith motor. Replace if contacts are burned or loose.
- Verify wiring: Compare motor terminal connections to the AO Smith wiring diagram for two-speed operation. Correct any miswiring.
- Test low-speed winding: A technician can measure resistance between low-speed terminals. An open circuit indicates a failed winding.
- Replace motor if winding is open: If the low-speed winding is defective, the motor assembly must be replaced to restore full functionality.
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Repair Difficulty
Medium
3/5
Required Part
Two-Speed Motor Assembly
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