Display shows COL and heater does not run; spa is in cold protection mode

Note: COL is typically a status, not a failure, indicating the spa is protecting itself from freezing.

• Verify water temperature: Use a separate thermometer to confirm actual water temperature.
• Allow spa to warm: Keep the cover closed and allow the circulation pump to run. The system will automatically exit COL mode once water temperature rises above the threshold.
• Check sensors if reading is incorrect: If the water is not actually cold but COL is displayed, inspect the temperature sensor connections at the control pack for corrosion or loose plugs.
• Ensure spa is not in an unheated environment: If the spa is outdoors in freezing weather, maintain power at all times so freeze protection can operate.