Pump runs but makes a high-pitched whine that changes with speed (on variable-speed models).

Safety first: Turn off power before touching the pump or adjusting mounts.

Steps to address:

• Confirm normal behavior: Many Jacuzzi variable-speed pumps emit some whine at specific RPMs. Test at different speeds to see if noise is limited to certain ranges.
• Check mounting: Tighten mounting bolts and add rubber isolation pads if needed.
• Listen for bearing noise: If the whine is accompanied by roughness or grinding, bearings may be failing.
• Adjust speed schedule: Avoid operating continuously at RPMs that cause resonance if possible.

Persistent or worsening whine with vibration may require motor replacement.