A.O. Smith T-D2-OS - Computer Board Specifications

T-D2-IN / T-D2-OS Service Manual
Ver. 1.00
31
CONFIDENTIAL
10-15. Computer board
Unit Part # #701 Takagi Part # EK439 Checkpoint N/A
Function
Controls the functions of most of the parts in the water heater.
Failure events
Malfunctioning computer
Effects on the water
heater if the computer
board fails
-A component(s) may not operate within the water heater. In most cases
of computer board failure, the whole the water heater does not operate at
all.
-Error codes will display.
Error codes when the
computer board fails
701 721 741 761
Diagnostic
Visual inspection: connection/breakage of wires and/or burn marks on the
computer board.
Color/Number of wires N/A
6-1/2" (165.05mm)
5-3/8" (138mm)
1-3/8" (35mm)
The computer board
differs from one in
the T
-
K3
-
SP/
OS.