Rinnai RH180, Installation Fundamentals

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Maintenance Codes
Maintenance codes flash on the temperature controller when a fault occurs.
Depending on the code, water flow or power may need to be reset to clear the code.
See owner's manual for a full detailed list of all codes.
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Diagnostic Codes and Remedies
Some of the checks below should be performed by a licensed professional. Consumers
should never attempt any action that they are not qualified to perform.
Code Definition Remedy
05 Air Filter Error. Follow the procedure “Air Screen Inspection, Detection and Cleaning” in the
operation / installation manual. If the error code continues to flash after
cleaning the air filter, review the items under “Code 10 ” or contact a qualified
service technician.
NOTE: This code will allow the water heater to continue operating.
07 Circulation flow
rate has dropped
below 2.1 GPM. Check the water filter for blockage.
Check pump operation and wiring.
Clean heat exchanger.
NOTE: This code will allow the water heater to continue operating.
10 Air supply or
exhaust blockage. Check that nothing is blocking the vent, inlet screen or “Combustion Air
Assembly”.
Check all vent components for proper connection.