Owner`s manual
42DO NOT DIVE.
TWILIGHT SPA – DIAGNOSTIC MESSAGES
MESSAGE MEANING ACTION REQUIRED
No message on display. Power has 
been cut off to the spa.
The control panel will be disabled until power 
returns. Spa settings will be preserved until next 
power up. 
Temperature unknown. After the pump has been running for 2 minutes, 
the temperature will be displayed.
“Overheat” - The spa has shut down. 
One of the sensors has detected 
118°F/48°C at the heater.
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.
“Overheat” - The spa has shut down. 
One of the sensors has detected that 
the spa water is 110°F/43°C.
DO NOT ENTER THE WATER. Remove the spa cover 
and allow water to cool. At 107°F/42°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.
“Ice” - Potential freeze condition 
detected.
No action required. The pump(s) will automatically 
activate regardless of spa status.
Spa is shut down. The sensor that is 
plugged into the Sensor “A” jack is 
not working.
If the problem persists, contact your dealer or 
service organization. (May appear temporarily in 
an overheat situation and disappear when the 
heater cools.)
Spa is shut down. The sensor that is 
plugged into the Sensor “B” jack is 
not working.
If the problem persists, contact your dealer or 
service organization. (May appear temporarily in 
an overheat situation and disappear when the 
heater cools.)
Sensors are out of balance. If alter-
nating with spa temperature, it may 
just be a temporary condition. If 
flashing by itself, spa is shut down.
If the problem persists, contact your dealer or ser-
vice organization. 
A significant difference between tem-
perature sensors has been detected. 
This could indicate a flow problem.
Check water level in spa. Refill if necessary. If the 
water level is okay, make sure the pumps have 
been primed. If problem persists, contact your 
dealer or service organization.
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.
Follow action required for “
” message. 
Heating capability of the spa will not reset auto-
matically; you may press any button to reset. 
Check filters for possible blockage.  
Possible inadequate water, poor flow, 
or air bubbles in detected in the heat-
er. Spa is shut down for 15 minutes. 
Check water level in spa. Refill if necessary. If 
water level is okay, make sure the pump(s) have 
been primed. Press any button to reset, or this 
message will automatically reset within 15 min-
utes. If problem persists, contact your dealer or 
service organization.
Inadequate water detected in heater. 
(Displays on third occurrence of “ ” 
message.) Spa is shut down.
Follow action required for “ ” message. Spa will 
not automatically reset. Press any button to reset.
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 connec-
tion instructions. Installation must be performed by a licensed electrician and all grounding connec-
tions must be properly installed.










