520 Indoor / 520 Outdoor Service Manual
Ver. 1.00
36
CONFIDENTIAL
10-18. Computer board
Unit Part #
#701
AOS Part #
319143-126
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 display.
Error codes when the
computer board fails
701
711
721
741
761
Diagnostic
Visual inspection: connection/breakage of wires and/or burn marks on the
computer board.
Color/Number of wires
N/A
5
"
(
1
2
8
.7
m
m
)
1 3 - 1 / 4 " ( 8 5 .7 m m )
