Display shows COL and spa does not heat even though set temperature is higher than water temperature.

Safety first: Ensure GFCI protection is working properly before operating the spa in freezing conditions.

• 1. Check mode settings: Review the user manual for your specific Freeflow model and verify the spa is not in economy or sleep mode, which can limit heating.
• 2. Verify set temperature: Increase the set temperature a few degrees above current water temperature and wait to see if the heater indicator turns on.
• 3. Confirm circulation: In cold conditions, the spa may run pumps periodically to prevent freezing. Ensure water is moving and that all jets and lines are free of ice.
• 4. Allow time: If power was just restored in very cold weather, the system may display COL while it gradually warms the water.

If the spa never begins heating despite proper mode and set temperature, there may be a sensor or control board issue. Have a technician diagnose further.