Pump runs but there is no water flow; the strainer pot does not fill.

Safety first: Turn off power before opening the pump or working on suction lines.

• Check pool water level: Ensure the water level is at least halfway up the skimmer opening so the skimmer does not draw air.
• Inspect lid O-ring: Remove the Lowara pump lid, clean the sealing surfaces, and inspect the O-ring for cracks or flattening. Replace if damaged and lubricate lightly with silicone grease.
• Check suction unions: Tighten unions on the suction side. If they can be turned by hand easily, remove, clean threads and gaskets, and reinstall.
• Prime the pump: Fill the strainer housing completely with water, replace the lid securely, open any air bleed valves, and start the pump. It may take several minutes to purge air.
• Investigate blockages: If prime is still lost, check skimmer baskets, main drain covers, and suction lines for obstructions. A professional may need to blow out the line.