Controller displays VAL or VALVE and the solar valve does not move when solar heat is requested.

Safety first: Turn off power to the controller and pump before working on the valve actuator. Do not manually force the valve while powered.

• Check actuator power: With power on and a call for solar, use a multimeter at the actuator leads to confirm the controller is sending the correct voltage (typically 24 VAC). If no voltage is present, suspect the controller or wiring.
• Inspect wiring: Turn power off, open the actuator cover, and check for loose or corroded wire nuts or terminal screws. Repair or replace damaged wiring.
• Test manual operation: Use the manual override lever on the valve body to ensure the Jandy-style diverter valve itself turns freely. If it is stiff or seized, the valve body may need service.
• Check cam settings: Verify the internal stop cams are set to allow full travel between pool and solar positions. Adjust cams according to the actuator manual.
• Replace actuator if necessary: If the motor hums but does not move, or if gears are stripped, replace the actuator with a compatible Heliocol-approved solar valve actuator.