Operating instructions
STARTUP 
Before turning on the power make sure you have read the Start Up 
instructions on page 6. When your hot tub power is first turned on 
it will display a series of numbers identifying the software version 
and the voltage input. It will then go into a 4 minute priming mode 
indicated by a Pr on the LCD display. During priming mode 
the HushPump™ will circulate the water through the filter and 
heating system to allow the temperature to be read. If your tub 
is not HushPump™ equipped the jet pump will not turn on until 
the prime mode times out or the   button is pressed to time 
out early. During prime mode the jet pump can be turned on to 
make sure they are fully primed and moving water in the tub. Do 
not allow an unprimed jet pump to run for more that 10 seconds. 
If the fill water temperature is below 50°F/ 9.5C freeze protection 
will activate all pumps immediately. While the circulation pump is 
running the display will show a - - indicating current temperature 
is not known. This will take two minutes. Once temperature is 
known it will be displayed on the LCD.
TEMPERATURE ADJUSTMENT
The temperature range is 80°F - 104°F / 26.0°C – 40.0°C. The 
default is 100°F/37.5°C. Any temp changes are saved in the 
system memory if power is interrupted. Press the   button 
to increase or lower the set points. If the   is pressed the set 
point will flash. Each press will move the set point 1 degree. If the 
set point is moving the wrong direction then stop pressing, let the 
temperature display stop flashing then press again to move the set 
point in the other direction. After adjusting the set temp the LCD 
will revert back to current water temp.
Note: if set temp is lowered more than 3°F/1.5C below current 
water temp the HushPump™™ will stop. The circulation will 
restart every 30 minutes to check if water temp has come down to 
set temp. It will also run continually during programmed times.
HEATING MODES
St – 
Standard Mode (Default Mode
) In Standard Mode 
the water is always heated to the set temperature. The display 
will show the temperature always with HushPump™ equipped 
systems. If non HushPump™, current water temperature will 
be shown when the pump is running and – when pump is not 
running. If your tub is not equipped with a HushPump™ the 2 
speed pump will come on every 30 minutes outside of filter cycles 
to poll for current water temperature. If you do not want this to 
happen use the Economy mode below.
Ec – 
Economy Mode:
 In Economy Mode the water is heated 
only during the filter cycle times. The factory default is F4 ( 4 
hours),2C (twice a day) If using the Economy mode you may need 
to alter these times to make sure the water is at your desired 
temp during your usual tub use times. The first filter cycle starts 
6 minutes after power is turned on. The display will alternate 
between the current temperature and Ec.
SL – 
Sleep Mode:
 In Sleep Mode the water is only heated to 
within 20°F/11°C of your set point and the heater only comes on 
during the programmed filter cycle times. This mode is typically 
only used for vacation time. The display will alternate between the 
current temperature and SL
To change heating modes press the   button then the   
button.
MASSAGE 
To activate this jet pump press the   button once to activate 
low speed, twice to activate high speed and three times to turn 
the pump off. The low speed will turn of automatically after 4 
hours and the high speed will turn off after 15 minutes. If tub is 
HushPump™ equipped, the low speed of the jet pump will come 
on automatically for 1 minute at the start of each filter cycle to 
purge the plumbing lines.
LightLightLight TempTempTemp
MassageMassageMassage
HeatHeatHeat
ET-50 TOPSIDE CONTROL PANEL OPERATING INSTRUCTIONS
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