P/N MVS504DZ-MGS504DZ_80_A 06/27/2007
Warning! Shock Hazard! No User Serviceable Parts.
Do not attempt service of this control system. Contact your dealer or service organization for assistance.
Follow all owner’s manual power connection instructions. Installation must be performed by a licensed
electrician and all grounding connections must be properly installed.
No message on display.
Power has been cut off to the spa.
Temperature unknown.
“Overheat” - The spa has shut down.* One of the
sensors has detected 118°F/47.8°C at the heater.
“Overheat” - The spa has shut down.* One of
the sensors has detected that the spa water is
110°F/43.5°C.
Spa is shut down.* The sensor that is plugged
into the Sensor “A” jack is not working.
Spa is shut down.* The sensor that is plugged
into the Sensor “B” jack is not working.
Sensors are out of balance. If alternating with
spa temperature, it may just be a temporary
condition. If flashing by itself, spa is
shut down.*
A significant difference between temperature
sensors has been detected. This could indicate a
flow problem.
Persistent low flow problems. (Displays on the
fifth occurrence of
message within
24 hours.) Heater is shut down, but other spa
functions continue to run normally.
Possible inadequate water, poor flow, or air
bubbles in detected in the heater. Spa is shut
down for 15 minutes.
Inadequate water detected in heater. (Displays on
third occurrence of
message.) Spa is
shut down.*
“Ice” - Potential freeze condition detected.
* - Even when spa is shut down, some equipment will
turn on if freeze protection is needed.
Message Meaning
Action Required
Diagnostic Messages
The control panel will be disabled until power returns. Spa settings will
be preserved until next power up.
After the pump has been running for 2 minutes, the current water
temperature will be displayed.
DO NOT ENTER THE WATER. Remove the spa cover and allow
water to cool. Once the heater has cooled, reset by pushing any button.
If spa does not reset, shut off the power to the spa and call your dealer or
service organization.
DO NOT ENTER THE WATER. Remove the spa cover and allow
water to cool. At 107°F/41.7°C, the spa should automatically reset. If
spa does not reset, shut off the power to the spa and call your dealer or
service organization.
If the problem persists, contact your dealer or service organization.
(May appear temporarily in an overheat condition).
If the problem persists, contact your dealer or service organization.
(May appear temporarily in an overheat condition).
If the problem persists, contact your dealer or service organization.
If the water level is normal, make sure all pumps have been primed. If
problem persists, contact your dealer or service organization.
Follow action required for
message. Heating capability of the spa will
not reset automatically; you may press any button to reset.
If water level is normal, make sure all pumps have been primed. Press any
button to reset. This message will reset within 15 minutes. If problem
persists, contact your dealer or service organization.
Follow action required for
message. Spa will not automatically reset.
Press any button to reset manually.
No action required. All equipment will automatically activate regardless
of spa status. The equipment stays on 4 minutes after the sensors
detect that the spa temperature has risen to 45°F/7.2°C or higher. An
optional freeze sensor may be added to protect against extraordinary
freeze conditions. Auxiliary freeze sensor protection is advisable is colder
climates. See your dealer for details.
Locking the Panel
Press “Time,” “Jets 1,” and “Warm” within 3 seconds. All
buttons are disabled except the “Time” button.
To unlock the panel, press the “Time,” “Jets 1,” and “Cool”
within 2 seconds.
Locking the Temperature
Press “Warm,” “Time,” “Jets 1,” and “Warm” within 3 seconds. The
“Warm” and “Cool” buttons are now disabled.
To unlock the temperature, press “Time,” “Jets 1,” and “Cool” within
2 seconds.
