Rheem IKONIC RTGH-S11i Training And Service Manual page 43

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A035 ERROR CODE
Improper thermistor connection
This tankless water heater has three thermistors (Inlet,
Outlet and Heat exchanger thermistor)
If one or more possibly has a poor connection or not
connected in proper location, the water heater displays
the " A035 " error code on the Liquid Crystal Display
(LCD) on the User
Turn Power OFF
Remove & reinsert connector "I"
Does A035 Error
code appear?
Yes
Remove and reinsert each thermistor
molexes connector. The color of each
molexes are below:
Inlet thermistor: White
Outlet thermistor: Black
Heat exchanger thermistor: Yellow
Exhaust Thermistor: Red/Black
Does A035 Error
code appear?
Yes
Test ALL thermistor.
Follow instructions for:
A031-Error code
A032-Error code
A033-Error code
A036-Error code
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IKONIC Tankless Water Heater Service Manual
Diagnostic Check
• Inlet thermistor
• Outlet thermistor
• Heat exchanger thermistor
Unit has a loose connection.
No
Thermistors appear to be OK.
No
Unit has a loose connection.
Thermistors appear to be OK.