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ICE on a Jacuzzi / Sundance hot tub: freeze protection active

The system has detected a possible freeze condition and has turned on the pumps to protect the plumbing. No action is needed if the tub is heating normally.

Also shown as: ICE2, freeze protection

Most likely causes

  1. 1Freezing weathermost likely
  2. 2Tub not heating for another reasoncommon
  3. 3Faulty sensorless common

What to try, in order

  1. Leave the power on and the cover closed.
  2. Confirm the tub is heating and the temperature is climbing.
  3. If it is not heating, look for another code and fix that fault quickly.
  4. Keep the equipment bay warm with a safe heat source if repair will take time.

ICE questions

Should I worry about ICE?

Only if the tub is also failing to heat. Otherwise it is the tub protecting itself.

Can I use the tub while ICE shows?

Yes, if the water is warm and balanced. The message clears when the sensors warm up.

Related codes

Balboa ICE · Freeze protection activeJacuzzi / Sundance -- · Watchdog shutdownJacuzzi / Sundance COOL · Water 20°F below setJacuzzi / Sundance FL1 · No flow detectedJacuzzi / Sundance FL2 · Flow switch stuck closedJacuzzi / Sundance FLO · Flow switch problemJacuzzi / Sundance HOLD · Panel buttons locked outJacuzzi / Sundance OH · Overheat protection

General guidance. Follow your manufacturer's instructions; anything inside the control box is work for a licensed professional. Updated October 5, 2026.