Rheem IKONIC RTGH-SR11i - Page 40

IKONIC Tankless Water Heater Service Manual
40
2.2 ERROR CODE LIST
A033 ERROR CODE
Outlet Thermistor Malfunction.
Diagnostic Check
Outlet Thermistor.
ERROR CODE DIAGNOSTICS
Turn Power OFF
Remove connector "H".
Measure resistance between #1 (Blue) & #11
wire (Yellow)
Reconnect connector "H". Operate unit.
If Error Code A033 appears: Replace control
board.
Clean scale build-up on outlet thermistor
Operate unit.
If error code A033 appears:
Replace outlet thermistor
Replace wiring harness for connector "H".
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.
Reconnect Molex.
Check resistance on connector "H" between
#1 wire (Blue) & #11 wire (Yellow)
Reinsert connector "H".
Operate the unit.
If error code "A033" 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