Balboa · VS / GS seriesHeads-up

SLP on a Balboa hot tub: sleep mode

The tub is in Sleep mode. It heats only during filter cycles and only to within about 20°F of the set temperature. It is a setting, not a fault.

Also shown as: SL, sleep mode

Most likely causes

  1. 1Mode was changed on the topside panel, often by accidentmost likely
  2. 2Set on purpose for vacation or low usecommon

What to try, in order

  1. Use the mode button sequence in your owner's manual to step from Sleep back to Standard mode.
  2. Confirm the display shows St or Std, or just the temperature.
  3. Allow several hours for the water to come back up to temperature.

SLP questions

Why is my hot tub 20 degrees colder than I set it?

Sleep mode holds the water about 20°F below the set point. Switch to Standard mode to heat fully.

When should I use Sleep mode?

When you will be away for a week or more in mild weather. It saves energy while keeping the water circulating and filtered.

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.