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General Messages
Priming Mode – MO19
Each time the spa is powered up, it will enter Priming Mode.
The purpose of Priming Mode is to allow the user to run each
pump and manually verify that the pump is primed (air is
purged) and water is flowing. This typically requires observing
the output of each pump separately, and is generally not
possible in normal operation. Priming Mode lasts 4 minutes,
but you can exit it earlier by pressing any Temp button. The
heater is not allowed to run during Priming Mode.
Water Temperature is Unknown
After the pump has been running for 1 minute, the temperature
will be displayed.
Too Cold - Freeze Protection
A potential freeze condition has been detected, or the
Aux Freeze Switch has closed, and the pump is activated,
depending on how your system was built. The pump is ON
for at least 4 minutes after the potential freeze condition has
ended, or when the aux freeze switch opens. In some cases,
the pump may turn on and off and the heater may operate
during Freeze Protection. This is an operational message, not
an error indication.
Water is too Hot (OHS) – MO29
One of the water temp sensors has detected spa water temp
110°F (43.3°C) and spa functions are disabled. System will
auto reset when the spa water temp is below 108°F (42.2°C).
Check for extended pump operation or high ambient temp.
J29 Warning – MO44
J29 is typically used as a Heater Disable input. As such, it
should not typically be shorted at power-up. This message
appears if J29 is shorted at power-up.
Reminder Messages
Alternates with temperature or
normal display.
Appears on a regular schedule, e.g. every 90 days.
Change the water in the spa on regular basis to maintain prop-
er chemical balance and sanitary conditions.
Alternates with temperature or
normal display.
Appears on a regular schedule, e.g. every 180 days.
Vinyl covers should be cleaned and conditioned for
maximum life.
Alternates with temperature or
normal display.
Appears on a regular schedule, e.g. every 365 days.
Filters should be replaced occasionally to maintain proper spa
function and sanitary conditions.
Appears on a regular schedule, e.g. every 365 days.
Check your ozone and/or UV generator per your spa
manufacture’s instructions.
Alternates with temperature or
normal display.
Appears on a regular schedule, e.g. every 365 days. Have a
service technician do a check-up on your spa per your spa
manufacturer’s instructions.
Heater-Related Messages
Heater Flow is Reduced (HFL) – MO16
There may not be enough water flow through the heater to
carry the heat away from the heating element. Heater start up
will begin again after about 1 min. See “Flow Related Checks”
below.
Heater Flow is Reduced (LF)* – MO17
There is not enough water flow through the heater to carry the
heat away from the heating element and the heater has
been disabled. See “Flow Related Checks” below. After the
problem has been resolved, you must press any button to reset
and begin heater start up.
Heater may be Dry (dr)* – MO28
Possible dry heater, or not enough water in the heater to start
it. The spa is shut down for 15 min. Press any button to
reset the heater start-up. See “Flow Related Checks” below.
Heater is Dry* – MO27
There is not enough water in the heater to start it. The spa is
shut down. After the problem has been resolved, you must
press any button to reset and restart heater start up. See “Flow
Related Checks”.
R U N
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C H E K
Heater is too Hot (OHH)* – MO30
One of the water temp sensors has detected 118°f (47.8°C) in
the heater and the spa is shut down. You must press any
button to reset when water is below 108°f (42.2°C). See “Flow
Related Checks” below.
A Reset Message may Appear with other Messages.
Some errors may require power to be removed and restored.
Flow-Related Checks
Check for low water level, suction flow restrictions, closed
valves, trapped air, too many closed jets and pump prime.
On some systems even when spa is shut down, some
equipment may occasionally turn on to continue monitoring
temperature or if freeze protection is needed.
Sensor-Related Messages
Sensor Balance is Poor – MO15
The temperature sensors MAY be out of sync by or 3°F. Call for
Service.
Sensor Balance is Poor* – MO26
The temperature sensors ARE out of sync. The Sensor Balance
is Poor fault has been established for at least 1 hour.
Call for Service.
Sensor Failure – Sensor A: MO31, Sensor B: MO32
A temperature sensor or sensor circuit has failed. Call for
Service.
Miscellaneous Messages
No Communications
The control panel is not receiving communication from the
System. Call for Service.
Pre-Production Software
The Control System is operating with test software. Call for
Service.
°F or °C is replaced by °T
The Control System is in Test Mode. Call for Service.
* This message can be reset from the topside panel with any
button press.
Memory Failure - Checksum Error* – MO22
At Power-Up, the system has failed the Program Checksum
Test. This indicates a problem with the firmware (operation
program) and requires a service call.
Memory Warning - Persistent Memory Reset* – MO21
Appears after any system setup change. Contact your dealer or
service organization if this message appears on more than
one power-up, or if it appears after the system has been run-
ning normally for a period of time.
* This message can be reset from the topside panel with any
button press.
Memory Failure - Clock Error* – MO20
Contact your dealer or service organization.
Configuration Error – Spa will not Start Up
Contact your dealer or service organization.
A Pump Appears to be Stuck ON – MO34
Water may be overheated. POWER DOWN THE SPA. DO NOT
ENTER THE WATER. Contact your dealer or service organization.
A Pump Appears to have been Stuck ON when spa was last
powered - MO35
POWER DOWN THE SPA. DO NOT ENTER THE WATER.
Contact your dealer or service organization.
The water level is too low
Some systems have a water level detect, and this mes-
sage appears if it detects that the water level is too low.
* This message can be reset from the topside panel with any
button press.
H T R
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