Solar heating never turns on even when pool is below setpoint and roof is hot; no error codes displayed.

Safety first: Follow controller manual when changing settings. No need to power off for normal menu adjustments.

• Check operating mode: Ensure the controller is set to automatic solar mode and not manual off or service mode.
• Verify setpoint: Confirm the desired pool temperature is set above the current pool temperature.
• Adjust differential: Set the solar-on temperature differential (difference between roof and pool) to a reasonable value (often 4–8°F) so the system will activate.
• Review timers: Disable any time-of-day lockouts that might be preventing solar operation during sunny hours.