Rheem IKONIC RTGH-S11i Training And Service Manual page 42

IKONIC Tankless Water Heater Service Manual
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A036 ERROR CODE
Exhaust Thermistor Malfunction.
Turn Power OFF
Remove connector "H".
Measure resistance between #4 wire (Red)
& #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 "A036" appears:
REPLACE CONTROL BOARD.
42
Diagnostic Check
Exhaust Thermistor.
Reinsert connector "H".
Yes
Operate unit. If Error Code A036 appears:
Replace control board.
No
Clean scale build-up on exhaust thermistor.
Operate unit. If Error Code A036 appears:
Replace exhaust thermistor.
No
Replace wiring harness for connector "H".