Error A200 - Rheem IKONIC RTGH-S11i Manual

ERROR CODE DIAGNOSTICS

ERROR A200

EXPLANATION
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.
Did "A200" error
code appear?
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.
61 IKONIC Tankless Water Heater Service Manual
No Unit had a loose connection.
Unit appears to be operating OK.
Check connector "E" and operate unit again.
No
If error code "A200" returns, replace control
board.