Error Codes - A.O. Smith T-H3S-DV Installation Manual And Owner's Manual

• The units are self-diagnostic for safety and convenience when troubleshooting.
• If there is a problem with the installation or the unit, the error code will be displayed on the
temperature controller and remote controller.
• Consult with the table on the following pages for the description of each error code.
Error code indicator on
the temperature controller
Error code indicator on the remote
controller 9008172005 (TM-RE40)
Example: If your unit has the "321" error code (which signifies an inlet thermistor failure)
• Indicator on the temperature
controller or Remote controller : "321" will be displayed on the screen in its entirety.
• Green LED on the computer board: The green LED on the computer board will be
Error codes will be displayed differently with units installed within an Easy-Link System, not only to show
what the error code is, but to also indicate which unit within the system has the error code. Below is a
sample of how the same error code is displayed in an Easy-Link System.
Example: If Unit #2 has the "321" error code (inlet thermistor failure)
• Indicator on the temperature controller
(Parent unit) or Remote controller :
"321" and "2" will intermittently flash on
the display. And it shows that Unit #2 has
the error.
• Unit #2:
"321" will intermittently flash on
the display. And the green LED on
the computer board will be blinking
two times, just like in the single
unit example.
• Unit #3
and #4: These units will not display anything, as the error code does not pertain to them.
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ERROR CODES

-General-
240 (T-H3J) and 340 (T-H3S) models
-Single unit Installations-
blinking two times.
-Easy-Link System-
(For the 540 (T-H3) model only)
Unit #1
PARENT
52
Page
Troubleshooting
540 (T-H3) model
Green LED
Error code on the computer board
Error code
Unit #2 Unit #3
CHILD CHILD
Owner's Guide
Green LED
Error code
Unit #
Unit #4
CHILD