Control panel shows ICE or IC, pumps may run automatically even when spa is not in use.

Safety first: Do not shut off power to the spa in freezing conditions; freeze protection relies on powered circulation.

• Verify outdoor conditions: ICE mode is normal when the spa is exposed to freezing temperatures. The system runs pumps to prevent plumbing from freezing.
• Check water level and cover: Ensure the spa is full and the cover is properly sealed to help maintain temperature.
• Monitor for normal exit: Once the water temperature rises above the freeze threshold, the ICE message should clear automatically.
• Sensor check: If ICE appears in warm weather, the temperature sensor may be faulty and reading too low, requiring replacement.

Continuous ICE mode in non-freezing conditions indicates a sensor or control issue that should be diagnosed by a spa technician.