IKONIC Tankless Water Heater Service Manual
44
ERROR CODE DIAGNOSTICS
ERROR A018
EXPLANATION
Lime build-up inside the heat exchanger
To prevent permanent damage to the unit, the unit must
be drained and flushed. Flushing procedure may need to
be repeated for excessive lime and scale build up.
Before starting flushing process, go to SERVICE and set
"Flush Heater?" to YES. When flushing is completed re-
turn the "Flush Heater?" setting to NO.
Refer to the Use & Care manual provided with the water
heater for complete flushing instructions.
After flush procedure has been done, clear the alarm. Re-
fer to “Clearing Current Alarms”.
NOTE: Flushing instructions utilize a submersible utility
pump.
(Provided with the Rheem/Ruud Tankless Flush Kit -
RTG20124)
Flushing frequency is based on water conditions and
average usage and should be conducted annually or as
recommended by a professional.
5 - Gallon Bucket
Utility Pump
Drain Hose
(hot water)
Hot Water
Service Valve
Cold Water
Service Valve
Drain Hose
(cold water)
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