Rheem GHE100-130 Use & Care Manual page 26

Temperature Adjustment :
Enter Menu Mode by pressing the "MENU" button on the LCD interface screen,
see Figure 11.
Press the UP or DN button to move the arrow to the Temperatures header.
Press OK to enter the Temperatures submenu, see Figure 12.
To adjust the water temperature set point, press the OK
button. The Set Point value will begin blinking( see Figure
13 above ). Press the UP or DN buttons to change the
value of the Set Point. Press the OK button to confirm
User interface
Figure 12 Menu Mode
Figure 13 Temperatures Menu
Press the MENU button to return to MAIN MENU screen.
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the setting. The interface automatically moves to the next
adjustable parameter (Differential setting) wherein such
parameter will begin blinking.
Water Temperature
Setting