How to Fix / Troubleshooting

Safety: Turn off power before opening the pump lid.

Open valves: Confirm all suction valves feeding the pump are fully open.
Manual prime: Remove the pump lid, fill the strainer pot completely with water, reinstall the lid, and restart the pump.
Check for air leaks: Inspect lid O-ring and suction unions as described in suction air leak troubleshooting.
Line blockage check: If only one suction source (e.g., skimmer) is used, try switching to another (e.g., main drain) if available to see if flow returns.

If the pump cannot maintain prime, a professional should check for underground line blockages or leaks.

Pump is unusually quiet and running, but there is no visible water movement in the pool.

Possible Causes