Balboa Water Group ML400 - Mach 3 User Guide User Manual
Page 4

Temp Set (80°F - 104°F / 26.0°C - 40.0°C)
The last measured temperature is constantly displayed 
on the LCD. Your spa’s set temperature range may 
vary from range shown above depending on your 
manufacturer’s settings.
Note that the last measured spa temperature displayed is 
current only when the pump has been running for at least 
1 minute.
Temp
Press the “Temp” button once to display the set 
temperature. To change the set temperature, press the 
pad a second time before the LCD stops flashing. Each 
press of the “Temp” button will continue to either raise 
or lower the set temperature.
If the opposite direction is desired, release the pad and 
let the display revert to the current water temperature. 
Press the pad to display the set temperature, and again 
to make the temperature change in the desired direction.
After three seconds, the LCD will automatically display 
the last measured spa temperature.
Mode
A button combination is used to switch between 
standard, economy, and sleep modes. Press “Temp” 
followed by “Light” to enter mode programming, press 
“Temp” to cycle through to desired mode (LCD flashes 
until confirmed), then press “Light” to confirm selection.
Standard mode maintains the desired temperature. 
Note that the last measured spa temperature displayed 
is current only when the pump has been running for 
at least 1 minute. “
” will appear on the display
momentarily when you switch into Standard Mode.
Economy mode heats the spa to the set temperature only 
during filter cycles. “
” will appear solid when the
temperature is not current and will alternate with the 
temperature when the temperature is current.
Pressing “Jets” while in Economy mode puts the spa in 
Standard-In-Economy mode, (“
”) which operates the
same as Standard Mode, then reverts to Economy Mode 
automatically after 1 hour. During this time, pressing 
“Temp” followed by “Light” will revert the mode to 
Economy immediately.
Sleep mode heats the spa to within 20°F (11°C) of the set 
temperature only during filter cycles. “
” will appear
on the display until mode is changed.
Standby Mode
Pressing “Temp” followed by “Aux” or “Jets 2” or 
“Blower” 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” 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
Press the “Jets” 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 timeout 
period. The pump 1 low speed timeout 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)
If your system has a second pump but your panel does 
not have a “Jets 2” button, use the “Aux” button to 
control pump 2. 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 timeout period.
Blower
(optional on some systems)
If your system has a blower (and only one pump), but 
your panel does not have a “Blower” button, use the 
“Aux” button to control the blower.
1-speed operation: on/off;
2-speed operation: med/hi/off; or
3-speed operation: lo/med/hi/off.
If left on, the blower will automatically turn off after a 
timeout period.
Circ Pump
(optional)
If your system is equipped with a circ pump, it may be 
configured to work in one of three different ways:
1) The circ pump operates continuously (24 hours) with 
the exception of turning off for 30 minutes at a time 
when the water temperature reaches 3°F (1.5°C) above 
the set temperature (most likely to happen in very 
hot climates).
2) The circ pump stays on continuously, regardless of 
water temperature.
3) The circ pump will come on when the system is 
checking temperature (polling), during filter cycles, 
during freeze conditions, or when another pump is on.
Page 2
