A.O. Smith T-H3-DV Service Manual

44 Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-19. Igniter
Part # • 319143-479 (EK153) Unit Part# #711
Function
-To ignite the gas/air mixtures when the water heater is ready to burn gas
on its burner surface.
-The output voltage of the igniter is more than 14 kVDC.
Failure events
1. Unable to ignite during the ignition process.
2. Makes attempts to ignite at all times.
Effects on the water heater
if the igniter fails
1. The water heater cannot ignite during the ignition process and the "111”
or “121” error codes will display.
2. No effects on the water heater, however, the durability of the igniter
wears down.
Error codes when igniter
fails
111 121
Diagnostic
1. Visual inspection: connection/breakage of wires and/or an observed
weak spark.
2. Check voltages: proper range of values shown below.
Color / Number of wires Purple(7)-Purple(7) 108 to 132 VAC Checkpoint B
Power supply
AC 108 to 132 V
To high voltage
ignite cable
SIG605
AC120V
1-3/4" (44 mm)
RBC
高電圧注意
MADE IN JAPAN
SIG605
AC120V
PBF
3/4" (20 mm)
1-1/2" (38 mm)
Back side
Label (Bar-code)

A.O. Smith T-H3-DV Specifications

General

Brand	A.O. Smith
Model	T-H3-DV
Category	Water Heater
Language	English