Balboa · BP series (TP400, TP600, TP800, TP900, spaTouch panels)Heads-up

MEM RSET on a Balboa hot tub: settings were reset

The system's stored settings were reset to defaults. Seeing it once after a setup change is fine. If it appears on more than one power-up, the board needs service.

Also shown as: M021, Persistent memory reset, The settings have been reset, MEMORY RESET

Most likely causes

  1. 1Settings or configuration were just changedmost likely
  2. 2Power interruption during a savecommon
  3. 3Failing memory on the circuit boardless common

What to try, in order

  1. Press any button to clear the message.
  2. Reset the time of day, filter cycles, and set temperature.
  3. Watch the next few power-ups. If the message keeps coming back, contact a technician.

MEM RSET questions

What does M021 mean?

M021 means the persistent memory was reset. Your filter times, clock, and preferences went back to factory defaults.

Do I need to worry about one MEM RSET message?

No. Set your preferences again. It only matters if it happens repeatedly.

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.