Manual [PDF] (24 pages)
- Updated: 30.05.2026
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25
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
26
ML550, 551, 554 Panel Operation (cont.)
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 time-
out period.
NOTE: If your system does not have a “Blower” button, and
is labeled as ”Jets 3” instead, please refer to the respective
User Guide listed above.
Light
Some systems are equipped with both a spa light and a fiber
optic light; however, only one can be accessed by this panel.
(Larger panels may be purchased so that both the spa light
and fiber optic light can be utilized.) Depending upon how
your spa is equipped and configured, the “Light” button will
operate in one of three ways:
1) Press the “Light” button to turn the spa light on and off,
and to shift between dim and bright settings if your light
is dimmable.
2) If a fiber-optic light with wheel is installed, press the
“Light” button once to start the light and wheel; press
it again to stop the wheel, and then again to turn the
light off.
3) If a fiber-optic light without a separate wheel stop is
installed, press the “Light” button to turn it on and off.
Both a spa light and a fiber optic light may be used
simultaneously on the EL8000 and EL5000 systems with a
different panel.
If any light is left on, it will automatically turn off after a
factory programmed time period.
Preset Filter Cycles
On all systems, the pump and the ozone generator will run
during filtration. At the start of each filter cycle, the blower
will run briefly on its highest speed to purge the air channels.
The lowest speed of any other pumps and the mister will
also run briefly. On some circ systems, pump 1 may also run
for the duration of the filter.
(Note: This panel cannot be used to program filter cycles
for systems that are programmed by time rather than by
duration. For these systems, a larger panel is needed and the
following description does not apply.)
The first filter cycle (“day”) begins 6 minutes after the spa is
powered up. The second filter cycle (“night”) begins 12 hours
later. Filter duration is programmable for 1-12 hours (“
”-“
”). The default filter duration can vary from system
to system. To program, press “Cool” or “Warm”, then “Jets 1”.
Press “Cool” or “Warm” to select the filter duration. Press
“Jets 1” to select the number of filter cycles. The display will
show “
” (both “day” and “night” cycles); “ ” (day cycle
only); or “ ” (“night” cycle only). Press “Cool” or “Warm” to
adjust, then press “Jets 1” to exit the programming mode. For
continuous filtration, use “
” and “
”.
Freeze Protection
If the temperature sensors within the heater detect a low
enough temperature, then the pump(s) and the blower
automatically activate to provide freeze protection.
The pump(s) and blower will run either continuously or
periodically depending on conditions.
In colder climates, an optional additional freeze sensor may
be added to protect against freeze conditions that may
not be sensed by the standard sensors. Auxiliary freeze
sensor protection acts similarly except with the temperature
thresholds determined by the switch. See your dealer
for details.
Locking Features
If this panel is used as the main panel, locking features will
not be available.
If this panel is used as a remote or additional panel, it will
lock when the main panel is locked. To unlock this panel,
unlock the main panel.
In the same way, the set temperature can be locked and
unlocked by a main panel. When the set temperature is
locked, it cannot be changed from either panel.
27
Clean-up Cycle (optional)
When a pump or blower is turned on by a button press, a
clean-up cycle begins 30 minutes after the pump or blower
is turned off or times out. The pump and the ozone generator
will run for one to four hours, depending on the system (on
some systems, you can change this setting.)
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 1.5°C (3°F) 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.
Ozone (optional)
On most systems, the ozone generator (if installed) runs
during filter cycles (except when pump 1 is operating at high
speed on a non-circ system) and during clean-up cycles. On
some systems, the ozone generator operates whenever the
pump runs.
If your system is configured with the optional ozone suppress
feature, the ozone generator will turn off for 1 hour any time
a function button (Jets 1, Jets 2, Blower, etc.) is pressed.
Displaying Info About Your Spa
There are several pieces of information about your spa that
can be called up from the panel, but are only needed in
special cases.
To access this information, press “Cool” or “Warm” then
“Jets 1”, then “Light”. (Each press must be within 3 seconds
of the previous press.) Then press “Cool” until you see “
” on the display. Press “Jets 1” to see the SSID (a series of
3 numbers, such as 100 133 10, which indicates the precise
revision of the software in your spa), followed by the Mach
software version number (such as 2.1), followed by “
” and then your spa’s network ID number (consisting of both
letters and digits displayed in 5 steps).
If you need to see this series of numbers again, and “
” is
once again on the display, just press “Jets 1” again.
When done, press the “Light” button (more than once if
necessary) until you see the normal temperature display.
User Preferences
There are several aspects of spa operation that you can
customize using the User Preferences submenu.
Press “Cool” or “Warm” then “Jets 1”, then “Light”. (Each press
must be within 3 seconds of the previous press.) At this
point, if “
” is not showing on the display, press “Cool”
until you see “
” on the display. Then press “Jets 1” to
enter the User Preferences submenu.
Once in the User Preferences submenu, press “Cool” or
“Warm” to cycle between these settings:
– Suppress Reminders
When set to “
”, reminders are never displayed on the
panel. When set to “
”, reminders are displayed on the
panel periodically.
– Temperature in Celsius
When set to “
”, temperatures are displayed on the panel
in degrees Celsius. When set to “
”, temperatures are
displayed in Fahrenheit.
– 24-hour Time Display
When set to “
”, time is displayed in 24-hour (military)
format (00:00 is midnight, 23:00 is one hour before midnight).
When set to “
”, time is displayed in 12-hour (am/pm)
format (12:00 is midnight, 11:00 pm is one hour before
midnight).
– Clean-up Cycle Duration (some systems only)
When set to “
”, Clean-up Cycles are disabled. When set
to “
” through “
”, the number indicates how many
hours each Clean-up Cycle will run.
28
ML550, 551, 554 Panel Operation (cont.)
– Dolphin II Address
When set to “
”, no addressing is used. Use this setting
for a Dolphin I, or for a Dolphin II which is set for no address
(which is the Dolphin II factory default). When set to
“
” through “
”, the number is the address (see your
Dolphin II manual for details).
Editing User Preferences
View the setting.
The left two characters (before the decimal point) tell
you what setting you’re viewing or editing, the right most
character (after the decimal point) tells you the value of that
setting (for example, “
” for Yes or “ ” for No).
If the value is flashing, you’re editing it. If the value is not
flashing, you’re just viewing it.
Press “Jets 1” to switch editing of the value on (flashing) or
off (not flashing). Once you’re editing the value (it’s flashing),
use the “Cool” or “Warm” buttons to change the value to the
one you want.
After you change the value, you must press “Jets 1” again to
stop the flashing before the change will register, and before
you can view or edit another setting.
If you don’t interact with the menu for more than 30 seconds,
it may time out.
If you press “Light” to back out of the menu, or pause
long enough for it to time out, while a value was flashing,
the changes you were making to that setting are not
remembered. But changes you previously made to other
settings will be in effect.
Any User Preferences that you change will stay in effect
“forever” or until you change them again (unless the spa’s
“persistent memory” is reset by a service technician), and
will override the factory defaults for those settings.
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