Pump is unusually loud with a low rumbling or cavitation sound, especially at higher speeds.

Safety first: Turn off power before cleaning baskets or adjusting valves.

• Clean all baskets:
  • Empty skimmer and pump baskets to reduce restriction.
• Open suction valves fully:
  • Ensure all suction Jandy valves are fully open.
• Reduce pump speed:
  • On VS pumps, lower RPM to reduce cavitation while still achieving required turnover.
• Long-term solution:
  • If plumbing is undersized, consult a pool professional about re-piping or adjusting pump sizing.