IKONIC Tankless Water Heater Service Manual
56
ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A018 ERROR CODE
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.
After flush procedure has been done. Clear current
alarm. Section 1.7.
NOTE: Flushing instructions utilize a submers-
ible utility pump.
(Provided with the Rheem/Ruud Tankless
Flush Kit - RTG20124)
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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