Rheem IKONIC RTGH-S11i Training And Service Manual page 39

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A032 ERROR CODE
Heat Exchanger Thermistor Malfunction.
Turn Power OFF
Remove connector "H".
Measure resistance between #1 wire (Blue)
& #11 wire (Yellow)
The resistance is
7K - 23K Ohms?
No
Remove control board bracket to access
inlet thermistor Molex near blower motor.
(How to Remove: Section 1).
Locate & separate WHITE Molex (located
near blower motor). Check resistance across
White wires on female end of Molex.
The resistance is
7K - 23K Ohms?
Yes
Reconnect Molex.
Check resistance on connector "H" between
#1 wire (Blue) & #11 wire (Yellow)
The resistance is
7K - 23K Ohms?
Yes
Reinsert connector "H".
Operate the unit.
If error code "A032" appears:
REPLACE CONTROL BOARD.
39
IKONIC Tankless Water Heater Service Manual
Diagnostic Check
Heat Exchanger Thermistor.
Reinsert connector "H".
Yes
Operate unit. If Error Code A032 appears:
Replace control board.
Clean scale build-up on heat exchanger
No
thermistor.
Operate unit. If Error Code A032 appears:
Replace heat exchanger thermistor.
No
Replace wiring harness for connector "H".