Igniter - A.O. Smith T-H3J-DV Service Manual

10-19. Igniter

Part #
Function
Failure events
Effects on the water heater
if the igniter fails
Error codes when igniter
fails
Diagnostic
Color / Number of wires
Label (Bar-code)
To high voltage
ignite cable
Power supply
AC 108 to 132 V
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
• 319143-479 (EK153)
-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.
1. Unable to ignite during the ignition process.
2. Makes attempts to ignite at all times.
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.
111
1. Visual inspection: connection/breakage of wires and/or an observed
weak spark.
2. Check voltages: proper range of values shown below.
Purple(7)-Purple(7)
SIG605
AC120V
Back side
44
Page
Unit Part#
108 to 132 VAC Checkpoint
1-3/4" (44 mm)
CONFIDENTIAL
Ver. 1.00
#711
121
B
SIG605
AC120V
PBF