A.O. Smith T-H3S-DV Installation Manual And Owner's Manual page 53

If the error code is displayed on the computer board of the water heater or remote controller and/or
temperature controller, please check the following. After checking, consult with the manufacturer.
Green
Remote
LED
031 One Time
101
Five Times
111
Three Times Ignition failure
121
Three Times Loss of flame
311
Two Times
321
Two Times
331
Two Times
341
Two Times
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-Fault Analysis of Error Codes-
Malfunction
description
Incorrect DIPswitch • Check the DIPswitch settings on the PCB (Part #701).
setting
Warning for the • Check the gas type of the water heater.
• Check if there is any blockage in the intake air and/
"991" error code
or exhaust.
• If the water heater is installed as a direct-vent
system, check whether there is enough distance
between the intake air terminal and the exhaust
terminal.
• Check the altitude/elevation of area of where the
water heater is installed.
• Check if there is grease and/or dirt in the burner (Part
#101) and the fan motor (Part #103), especially if the
water heater has been installed in a contaminated area.
• Check if the Hi-limit switch (Part #412) is properly
functioning.
• Check for connection/breakage of wires (Part #413, 708,
709, 710, 712), burn marks on the computer board (Part
#701), and/or soot on the flame rod (Part #108).
• Check if there is a buzzing spark ignition sound
coming from the burner (Part #101) when water
heater prepares for combustion.
• Listen for the double "clunk" sound coming from gas
valve assembly (Part #102) when water heater goes
into combustion.
• Check if there is leaking from heat exchanger (Part #401).
• Check if the Hi-limit switch (Part #412) is properly
functioning.
• Check for connection/breakage of wires (Part #413,
708, 709, 710, 712), burn marks on the computer
board (Part #701), and/or soot on the flame rod
(Part #108).
• Check if there is leaking from heat exchanger (Part #401).
Outlet thermistor
failure (240 (T-H3J) /340
(T-H3S) models only)
Heat exchanger
thermistor failure
(540 (T-H3)
model only)
• Check for connection/breakage of wires and/or
Inlet thermistor
debris on thermistor (Part #407, 408, 411, 715).
failure
Outlet thermistor
failure (540 (T-H3)
model only)
Exhaust thermistor
failure (Indoor
models only)
53
Diagnosis
Page
Owner's Guide
Troubleshooting