A.O. Smith 240 T-H3J Service Manual page 48

Natural of Fault
running.
recirculation line has enough check valves.
cold and stays cold
operation has stopped
2 Check how long the water heater has been installed and in use.
3 Check the installation place.
installed.
5 Check the vent length, when the water heater has been installed
indoors.
the water heater has been installed in laundry room.
water heater has been installed in restaurant.
Natural of Fault
water temperature
5 Gas solenoid valve (SV
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
hot water lines.
Normal: 93 to 120 VDC between COM (blue) & #9 (green)
(during operation)
Normal: 93 to 120 VDC between COM (blue) & #73 (red)
(during operation)
1
48
Diagnosis
Diagnosis
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CONFIDENTIAL
Ver. 1.00
Check
point
Check
point
C
C