Rheem IKONIC RTGH-S11i Training And Service Manual page 52

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A070 ERROR CODE
Microcomputer Abnormality.
If the microcomputer on the control board is not work-
ing properly, the water heater displays the "A070" error
code on the User Interface.
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Diagnostic check items
• Control board
Turn Power OFF
Turn power ON and operate unit.
If "A070" error code is appeared, please
replace the control board.