Water appears to drain backwards from the roof into the pool equipment when the system shuts off.

Safety: Turn off pumps and relieve pressure before removing any valves.

• Locate check valve: Identify the check valve on the solar return line near the equipment pad.
• Inspect orientation: Ensure the arrow on the valve body points in the direction of normal flow from panels to pool.
• Clean or replace: Remove the valve and inspect the internal flapper or spring. Clean debris and reassemble, or replace the valve if worn.
• Test operation: Restart the system and observe shutoff behavior to confirm proper check action.