Pool is not warming up even on sunny days; solar system appears to run normally.

Safety: No special hazards beyond normal pool equipment operation.

• Check panel temperature: Carefully feel the return line from the Fafco panels when running. It should be noticeably warmer than the pool water.
• Verify valve positions: Ensure the solar bypass or mixing valve is fully directing flow through the panels during solar operation.
• Inspect for shading: Look for new trees, structures, or debris shading the Fafco panels during peak sun hours.
• Confirm run time: Check the controller's schedule and differential settings to ensure the system runs long enough each day.
• Consider capacity: If all is correct but heating is still inadequate, consult sizing charts; additional Fafco panels may be required.