Rheem IKONIC RTGH-SR84i - Error A033

IKONIC Tankless Water Heater Service Manual
48
ERROR A033
EXPLANATION
Outlet Thermistor Malfunction.
Diagnostic Check
Outlet Thermistor.
ERROR CODE DIAGNOSTICS
Turn Power OFF
Clean scale build-up on outlet thermistor
Operate unit.
If error code A033 appears:
Replace outlet thermistor
Replace wiring harness for connector “I”.
Remove control board bracket to access inlet
thermistor Molex.
Locate & separate BLACK Molex (located near
blower motor). Check resistance across Black
wires on female end of Molex.
Reconnect Molex.
Check resistance on connector “I” between
#5 wire (Black) & #1 wire (Blue)
Reinsert connector “I”.
Operate the unit.
If error code "A033" appears:
REPLACE CONTROL BOARD.
The resistance is
7K - 23K Ω?
The resistance is
7K - 23K Ω?
No
No
Yes
Yes