Error Code List - Rheem Iconic RTGH-S11i Training And Service Manual

ERROR CODE DIAGNOSTICS

2.2 ERROR CODE LIST

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