IKONIC Tankless Water Heater Service Manual
38
2.2 ERROR CODE LIST
A031 ERROR CODE
Inlet Thermistor Malfunction.
Diagnostic Check
Inlet Thermistor.
ERROR CODE DIAGNOSTICS
Turn Power OFF
Remove connector "I".
Measure resistance on connector "I"
between #5 wire (Black) & #7 wire (White)
Reconnect connector "I" and operate unit.
If error code "A031" appears:
Replace control board
Clean scale build-up on inlet thermistor,
and operate unit.
If error code "A031" appears:
Replace inlet thermistor
Replace wiring harness for connector "I".
Remove control board bracket to access
inlet thermistor Molex.
Locate & separate WHITE Molex Measure
resistance across black wires on female end
of Molex
Reconnect Molex.
Measure resistance on connect "I" between
#5 wire (Black) and #7 wire (White)
Reinsert connector "I", and operate the unit.
If error code "A031" appears:
REPLACE CONTROL BOARD.
The resistance is
7K - 23K Ohms?
The resistance is
7K - 23K Ohms?
The resistance is
7K - 23K Ohms?
No
No
No
Yes
Yes
Yes
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