Solar return water is excessively hot, causing uncomfortable pool temperature spikes.

Safety: Avoid contact with very hot return water; adjust settings with dry hands.

• Lower setpoint: On the Fafco controller, reduce the desired pool temperature to a comfortable level.
• Check valve operation: Observe the solar valve actuator when the pool reaches setpoint. It should rotate to bypass the panels. If not, troubleshoot the actuator and wiring.
• Verify sensor readings: Ensure the pool sensor is properly installed in flowing water and not exposed to hot surfaces.
• Install or adjust bypass: If the system lacks a proper bypass, consult installation guidelines to add a mixing or bypass valve to moderate return temperature.