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OH on a Jacuzzi / Sundance hot tub: overheat protection

The water temperature is above the safe limit, about 112°F. Do not enter the water. Take the cover off and let it cool.

Also shown as: OHH, overheat

Most likely causes

  1. 1Filter cycles too long in hot weathermost likely
  2. 2Dirty filter restricting flowcommon
  3. 3Failed temperature sensorless common
  4. 4Pump or heater relay stuck onless common

What to try, in order

  1. Stay out and remove the cover.
  2. Check the temperature with a thermometer.
  3. Turn off power at the breaker and clean the filter.
  4. Restore power once the water has cooled, and shorten the filtration time in hot weather.
  5. If OH comes back, switch the tub off at the breaker and call your dealer or a technician.

OH questions

Is OH dangerous?

Yes, for bathers. Water over 104°F can cause overheating and fainting. Stay out until it cools.

Why does it happen in summer?

Pump heat and a well-insulated cover can push the water past the set point when the air is hot.

Related codes

Balboa OH · Heater overheatGecko OH · Spa water overheatHydro-Quip OH · Overheat protectionJacuzzi / 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 problem

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