AO Smith pool pump produces a high-pitched whine from the drive area on a variable-speed model, especially at certain speeds.

Safety First: Turn OFF power before tightening covers or mounts.

• Identify source: Listen closely to determine if the noise is from the drive/control area or the motor bearings.
• Tighten covers: Secure the control housing cover and any brackets that may vibrate.
• Adjust speed: Slightly change programmed speeds to avoid resonance frequencies that are particularly noisy.
• Monitor bearings: If the whine is accompanied by roughness or heat at the motor, inspect bearings and replace the motor assembly if needed.