Control panel displays E4 and pump will not run or shuts down shortly after starting.

Safety First: Always unplug the pump before disconnecting hoses or opening the housing.

• Check pool water level: Ensure the water level is above the minimum mark on the pool wall and fully covering the intake fittings.
• Inspect suction hose connections: Tighten hose clamps at the pool wall fitting and pump inlet. Replace cracked or flattened hoses that may be drawing air.
• Prime the pump: Remove the pump lid (if accessible) and fill the housing completely with pool water. Reinstall the lid, ensuring the O-ring is clean and lubricated. Open all valves fully.
• Clear obstructions: Remove and clean the skimmer basket and any in-line strainers. Flush the suction hose with water to remove trapped air and debris.
• Restart: Plug the pump back in and start it. If E4 returns immediately with good water level and no air leaks, the internal flow or dry-run sensor may be faulty and the control head may need replacement.