A.O. Smith ATX-199 Instruction Manual page 59

WATER HEATING UNIT CONTROLLER FAULT AND ALERT CONDITIONS
Green
Controller
LED
031 One
setting
101 Five Warning for the
111 Three
121 Three
311
321
331
341
391
441
510 Six
551 Six
611 Four
651 Four
Table 23. Control Board Green LED Flash Codes
Malfunction
Description
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Diagnosis
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