Takagi AT-K5U-OS User Manual

49 Page
Troubleshoong
Owner's Guide
Error code
ERROR CODES
-General-
 The units have self-diagnostic functions 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 built-in
controller or remote controller.
 Consult the table on the following pages for the description of each error code.
-Single unit Installaons-
Example: If your unit has the “321” error code (which signifies an inlet thermistor failure)
 Indicator on the built-in controller
and/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 indicate this code with
two flashes every 1/2 second. The pattern will repeat with a three second delay between patterns.
Error code Green LED
on on on on
on on
off off off off off
321
Error Indication

110U and 310U
(AT-KJr3/K5-IN/OS)
510U (AT-D3U-IN/OS)
Error code indicator on
the built-in controller
Error code indicator on
the remote controller
Error Code
on the temperature
controller
Green LED
The number
of flashes
Flash paern
031 701 711
One
311 321 331
391 441
Two
111 121
Three
611 651 661
Four
101 991
Five
510 551 721
Six
on on
off
off
0.5 sec. on, O.5 sec. off 3 sec. off

Takagi AT-K5U-OS Specifications

General

Brand	Takagi
Model	AT-K5U-OS
Category	Water Heater
Language	English