Rheem IKONIC RTGH-S11i Training And Service Manual page 62

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A200 ERROR CODE
Translator to Water Heater Communication Failure.
User Interface is not communicating with control board.
Diagnostic check items
• User interface.
Turn Power OFF
Remove and reinsert connector "E" and the
molex connected to user interface.
Visually inspect user interface wiring for
loose or damaged connections.
Turn power ON and operate unit.
Is "A200" error
code appeared?
Yes
Test DC voltage between #5 wire (Red) &
#4 wire (Black) at Connector "E".
Is the voltage
11-17 DC volts?
Yes
Operate unit again.
If error code "A200" returns, replace user
interface.
62
Unit has a loose connection.
No
Unit appears to be operating OK.
Check connector "E" and operate unit
No
again.
If error code "A200" returns, replace control
board.