A.O. Smith T-H2-DV Service Manual page 88

<How to set the Freeze protection pump >
To set the Freeze protection pump mode in T-H2-DV/T-H2-OS, please follow the procedures below:
1. Change the dipswitch No.4 of the right bank on the computer board to the "OFF" position (Individual
operation mode should be oFF position) .
2. If the TM-RE30 installed, turn off the TM-RE30.
3. While in Stand by mode (cannot be in combustion, forced-combustion, or FM adjustment modes),
press and hold the "Increase" button for at least 5 seconds or longer to enter "Diagnostic Mode".
4. Scroll through the needed information (mode# P1)by pressing the "Increase" or "Decrease" buttons
to scroll up or down on the "3-digit 7-Seg LED".
5. While the "P1" is displayed, press the "Number display" button.
6. The "3-digit 7-seg LED" will display "on".
7. When the "Increase" button is pressed for at least 3 seconds or 30 minutes have elapsed without
pressing any buttons, the display will return to normal.
T-H2-DV/T-H2-OS Computer board
Right bank of dipswitches
88
CONFIDENTIAL
T-H2-DV/T-H2-OS Service Manual
Ver. 1.01