Computer Board - A.O. Smith T-D2-OS Service Manual

10-15. Computer board

Unit Part #
Function
Failure events
Effects on the water
heater if the computer
board fails
Error codes when the
computer board fails
Diagnostic
Color/Number of wires
The computer board
differs from one in
the T-K3-SP/OS.
#701 Takagi Part #
Controls the functions of most of the parts in the water heater.
Malfunctioning computer
-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.
701
Visual inspection: connection/breakage of wires and/or burn marks on the
computer board.
T-D2-IN / T-D2-OS Service Manual
EK439
721
N/A
31
CONFIDENTIAL
Ver. 1.00
Checkpoint
741 761
N/A