MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
44
Temperature
Controls
Up/Down
LCD Temperature
Display
Menu/Back
Select
Buttons
Heater
"OFF"
Switch
Heater
ON LED
Indicator
Pool/Spa
Toggle Button
Figure 44. Heater Control Panel
Control Panel Description
LCD Display:
The LCD displays two lines of text.
During normal heater operation the current pool or spa
water temperature is shown on line 1 of the display.
The heater set point for the pool or spa is shown on
line 2 of the display. The display will turn off after
two (2) minutes of inactivity on the keypad. When the
display is off due to inactivity, pressing any button
will turn it back on.
POOL/SPA:
Toggles between POOL and SPA
mode: Displays the selected pool or spa body of
water
actual temperature and set point.
HEATER OFF:
Press this button to put the heater into
IDLE/OFF mode. The LCD will display HEATER OFF.
UP Arrow Button:
Increase heater temperature set point. Scroll through menu items and change settings.
DOWN Arrow Button:
Decrease heater temperature set point. Scroll through menu
items and change settings.
SELECT:
Select current menu item or save menu item settings.
MENU/BACK:
Enter menu items. Press Down to scroll through menu item. Press Menu/Back to return to main screen.
HEATING (LED):
Solid Red LED on indicates the heater currently heating.
LED Off:
Heater is not active. Note: During
the heater ignition process, this LED blinks.
Menu Navigation
1. Press MENU/BACK displays POOL MAX. Use the DOWN or UP button to scroll through each of the highlighted
menu items.
2. Press SELECT to access the highlighted item. Press UP/DOWN to change or view the highlighted item.
3. Press SELECT to save, exit the setting and return to the menu items. Note: To exit the menu without saving and
return to the main screen, press MENU/BACK two times.
Operating the Heater
The heater comes factory set at 78°F for the pool mode and 100°F for the spa mode. Using the up and down
arrows, you can set the thermostats to a minimum temperature of 65° F., or a maximum of 104° F.
Heating the Pool or Spa (Press the HEATER OFF button to turn OFF the heater).
• Press POOL/SPA to select either Pool or Spa. The display shows the current set point and water temperature.
Press Up/Down to increase or decrease water set point temperature. If the current water temperature is below the
Set point water temperature, the heater will begin heating.
CONTROL PANEL
Section 2. Operations
