A.O. Smith 110 Troubleshooting Manual page 13

ERROR CODE 031 [510 (T‐D2)], ONE FLASH/03 [110 (T‐KJR2), 310 (T‐K4)]
INCORRECT DIPSWITCH SETTINGS
1) Turn off the power supply.
2) Remove front cover and locate the dipswitches on the center of the computer board.
3) Check the dipswitch settings on the left and right banks. Refer to p.19 for the correct dipswitch
positions.
a. Gas type is a common dipswitch error.
b. Most other switches should be on default setting UNLESS the particular setup requires
otherwise.
c. Easy‐Link systems: The master heater shall have the number 10 dipswitch on the right bank in
the ON position (left). The remaining heaters (the slave heaters) will have the number 10
dipswitch in the OFF position (right) and the communication wires will be attached to the slave
in/out plugs.
ERROR CODE 101[510 (T‐D2)], FIVE FLASHES/10 [110 (T‐KJR2), 310 (T‐K4)]
ABNORMAL COMBUSTION
1) Blockage in the airway. Check the following areas:
a. Venting length obstruction (Birds' nests, trash, etc.)
b. Backflow preventer installed backwards
c. Heat exchanger
d. Fan
2) Check the manifold pressure (p. 22). Adjust the manifold pressure to the correct values if necessary.
3) If intake air is contaminated with dust, lint (laundry machine nearby), grease (kitchens), or other
contaminants, clean the burner. See p. 26 on procedures for cleaning the burner & rod assembly.
4) Weather related issues: high winds, frozen vent termination flap, etc.
5) Installations at altitudes around or over 3000 feet: Change dipswitches on the computer board for
FM+ modes. See dipswitch explanations on page 19.
6) Make sure all dipswitches are set properly for the type of installation.
7) If the cause of the 101 error code has been determined and solved, reset the computer board to
clear the error code (p. 23).
ERROR CODE 111 [510 (T‐D2)], THREE FLASHES/11 (110 [T‐KJR2), 310 (T‐K4)]
IGNITION FAILURE
Heater does not fire after three failed attempts at ignition.
1) Verify that the hi‐limit switch is not tripped. Turn the
power off to the unit. Push the white button in. The
switch will reset when you hear and feel the button click.
Turn the power back on and test the heater. If the unit
fires on, the cause of the hi‐limit trip must be determined.
Please contact the Technical Service Department for
further technical support.
2) Check the gas supply. Verify that sufficient gas is being
supplied to the heater and the gas line is clear of debris or
any air. Purge the line of air if needed (p. 22).
a. It is possible there is a faulty pressure regulator at the
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Troubleshooting Guide
Figure 6