Balboa ML550 Manual

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ML550, 551, 554 Panel Operation

Cool/Warm  

 ML500, 551, 554 

Press the “Cool” or “Warm” button once to display the set 

temperature. Each time either button is pressed again, the 

set temperature will increase or decrease depending on 

which button is pressed. After three seconds, the LCD will 

automatically display the last measured spa temperature.

Mode 

 ML500, 551, 554

This button is used to switch between Standard, 

Economy, and Sleep modes. Press “Mode” to enter mode 

programming, press “Cool” to cycle through to desired 

mode (LCD flashes until confirmed), then press “Mode” to 

confirm selection.

Sleep mode heats the spa to within 11°C (20°F) of the set 

temperature only during filter cycles. “

” will appear on 

the display until mode is changed.

Standby Mode 

Pressing “Cool” or “Warm” followed by “Blower” or “Jets 2” 

or “Aux” will turn off all spa functions temporarily. This is 

helpful when changing a filter. Pressing any button exits 

Standby mode. On some systems the “Jets 1” button will 

control the pump in Standby Mode (“Drain Mode”). In this 

case, press any other button to exit. System will revert to 

previous mode after 1 hour.

Jets 1  

Press the “Jets 1” button once to turn pump 1 on or off, and 

to shift between low and high speeds if equipped. If left 

running, the pump will turn off after a time-out period. The 

pump 1 low speed time-out on some systems may be as 

long as 4 hours.

On non-circ systems, the low speed of pump 1 runs when 

the blower or any other pump is on. It may also activate 

for at least 1 minute every 30 minutes to detect the spa 

temperature (polling) and then to heat to the set temperature 

if needed, depending upon mode. When the low speed turns 

on automatically, it cannot be deactivated from the panel; 

however, the high speed may be started.

Jets 2  

  (optional on some systems)

Press the “Jets 2” button once to turn pump 2 on or off, and 

to shift between low and high speeds if it is a two-speed 

pump. If left running, the pump will turn off after a 

time-out period.

Please refer to the following User Guides for more detailed information:

ML551/ML554 User Guide: P/N 40632-99

ML 550 User Guide: P/N 40569-99

ML551

ML554

Heat

Heat

Warm

Light

Warm

Jets 1

Jets 2

Light

Mode

Cool

Blower

ML550

Heat

Heat

Warm

Light

Warm

Jets 1

Jets 2

Light

Mode

Cool

Blower

Heat

Cool

Warm

Jets 1

Jets 2

Blower

Light

Mode