IKONIC Tankless Water Heater Service Manual
61
ERROR A200
EXPLANATION
Water Heater Communication Failure.
User Interface is not communicating with control board.
Diagnostic check items
• User interface.
ERROR CODE DIAGNOSTICS
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.
Unit had a loose connection.
Unit appears to be operating OK.
Check connector “E” and operate unit again.
If error code “A200” returns, replace control
board.
Test DC voltage between #5 wire (Red) &
#4 wire (Black) at Connector “E”.
Operate unit again.
If error code “A200” returns, replace user
interface.
Did “A200” error
code appear?
Is the voltage
11-17 DC volts?
Yes
No
No
Yes
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