Control Panel; Menu Navigation; Operating The Heater - Pentair MT125 Installation And User Manual

Section 2. Operations
46

CONTROL PANEL

Control Panel Description
The LCD displays two lines of text. During
LCD Display:
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.
Toggles between POOL and SPA mode:
POOL/SPA:
Displays the selected pool or spa body of water
actual temperature and set point.
Press this button to put the heater into
HEATER OFF:
IDLE/OFF mode. The LCD will display HEATER OFF.54
Increase heater temperature set point. Scroll through menu items
UP Arrow Button:
and change settings.
Decrease heater temperature set point. Scroll through menu
DOWN Arrow Button:
items and change settings.
Select current menu item or save menu item settings.
SELECT:
Enter menu items. Press Down to scroll through menu item. Press Menu/Back to return to main screen.
MENU/BACK:
Solid Red LED on indicates the heater currently heating.
HEATING (LED):
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.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Pool/Spa
Toggle Button
Heater ON Toggle
Red LED switch
Indicator displays
Heater/Off
Figure 46. Heater Control Panel
Heater is not active. Note: During
LED Off:
LCD Temperature
Display
Menu/Back Temperature
Select Controls
Buttons Up/Down
460906 Rev. D 8/2020