Balboa · BP series (TP400, TP600, TP800, TP900, spaTouch panels)Stop using the tub

WATER TOO HOT on a Balboa hot tub: spa water too hot

The system has detected spa water at about 110°F or more and has disabled spa functions. Do not enter the water until it cools below 104°F.

Also shown as: M029, OHS, The water is too hot

Most likely causes

  1. 1Long filter cycles or heavy pump use in hot weathermost likely
  2. 2High outdoor temperature with the cover oncommon
  3. 3Pump stuck runningless common
  4. 4Sensor reading highless common

What to try, in order

  1. Stay out and remove the cover so the water can cool.
  2. Check the real temperature with a floating thermometer.
  3. Wait for the water to fall below about 108°F. The system resets automatically.
  4. Shorten the filter cycles and schedule them at night.
  5. If the pump will not shut off, turn the tub off at the breaker and call for service.

WATER TOO HOT questions

What does M029 mean?

M029 is the Balboa BP code for spa water that is too hot, about 110°F. Older panels show it as OHS.

How do I stop my hot tub overheating in summer?

Reduce filter cycle time, run cycles at night, and prop the cover open a little on hot days. Pump friction is what adds the extra heat.

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.