Rheem IKONIC RTGH-S11i Training And Service Manual page 40

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A033 ERROR CODE
Outlet Thermistor Malfunction.
Measure resistance between #1 (Blue) & #11
Remove control board bracket to access
inlet thermistor Molex near blower motor.
Locate & separate WHITE Molex (located
near blower motor). Check resistance across
Check resistance on connector "H" between
Turn Power OFF
Remove connector "H".
wire (Yellow)
The resistance is
7K - 23K Ohms?
No
(How to Remove: Section 1).
White wires on female end of Molex.
The resistance is
7K - 23K Ohms?
Yes
Reconnect Molex.
#1 wire (Blue) & #11 wire (Yellow)
The resistance is
7K - 23K Ohms?
Yes
Reinsert connector "H".
Operate the unit.
If error code "A033" appears:
REPLACE CONTROL BOARD.
40
Diagnostic Check
Outlet Thermistor.
Reconnect connector "H". Operate unit.
Yes
If Error Code A033 appears: Replace control
board.
Clean scale build-up on outlet thermistor
No
Operate unit.
If error code A033 appears:
Replace outlet thermistor
No
Replace wiring harness for connector "H".