Balboa · VS / GS seriesStop using the tub

OHS on a Balboa hot tub: spa water too hot

The spa water itself has reached about 110°F and the spa has shut down. Do not get in until the water cools below 104°F.

Also shown as: OH S, spa overheat

Most likely causes

  1. 1Filter cycles too long in hot weathermost likely
  2. 2Hot outdoor temperatures with the cover closedcommon
  3. 3Circulation pump or jet pump stuck runningless common
  4. 4Faulty temperature sensor reading highless common

What to try, in order

  1. Stay out of the water and remove the cover so heat can escape.
  2. Wait for the water to drop to about 107°F, then press any button to reset the panel.
  3. Check the real water temperature with a floating thermometer to see if the panel reading is accurate.
  4. Reduce the filter cycle length and move it to the cooler part of the night.
  5. If a pump keeps running when it should be off, switch the tub off at the breaker and call for service.

OHS questions

What is the difference between OH and OHS on a Balboa?

OH (or OHH) means the heater area hit about 118°F. OHS means the spa water itself hit about 110°F. Both shut the spa down until it cools.

Can I add cold water to clear OHS faster?

Yes. Taking the cover off and adding some cold water from a hose is a safe way to bring the temperature down. Retest your water balance afterward.

Related codes

Balboa -- · Temperature not yet knownBalboa CHEK PH · Maintenance reminderBalboa CLN FLTR · Filter reminderBalboa CNFG FAIL · Configuration errorBalboa dr · Heater may be dryBalboa dry · Heater is dryBalboa Ecn · Economy modeBalboa FLO · Low water flow

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