Rinnai RUC80i Training Program page 75

Maintenance:
70
71 Solenoid Valve circuit
72 Flame sensing device circuit
73 Burner Sensor Circuit
79
Scale Build-up in Heat Exchanger ( "00" is
LC (00)**
substituted for "LC" in diagnostic code history)
FF Maintenance Performed
Unit does not operate or post an error code
NO Code
when water flow is initiated.
** After an LC code is temporary cleared the unit will operate for 70 hours before shutting down again with the next LC
code (LC-0 through LC-9). After service is performed (flushing) the LC code sequence will need to be reset to. This is
accomplished by pressing the "A" and "B" test switches at the same time for approximately 5 seconds. The unit will return
to normal operation and the LC# count will return to "0".
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Fault Codes.
PC Board
Water leak detected
Enhancing Lives By Changing The Way Water Is Heated
Check the PC Board DIP switches for correct position.
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Check the wiring harness connections at the PC Board
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Replace the PC Board.
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Replace the PC Board.
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Replace the PC Board.
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Replace the PC Board.
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Turn off water supply
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Determine and correct source of the water leak.
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- LC1 ~ LC9 indicates there is possible scale buildup in the heat exchange. Refer to
instructions in manual.
- Replace heat exchanger in extreme cases of scale buildup or internal clogging.
- To operate the water heater temporarily, push the ON/OFF button on the temperature
controller 5 times. **Repeated LC codes will eventually lock out the water heater.
Indicates a service provider performed maintenance or repair and flagged this action.
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Enter this code in the history by pressing and holding the UP, then Down and then ON/OFF
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buttons. The buttons must be pushed in that order.
Check/clean inlet water supply filter
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Ensure the minimum activation water flow rate is met.
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Ensure hot and cold water lines are not reversed / cross connected.
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Ensure there is not a crossover / cross connection somewhere in the building plumbing or a
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plumbing fixture.
Check to ensure the water flow turbine is not clogged / damaged.
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Measure voltage to and from the water flow sensor
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Measure the water flow sensor resistances.
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75 5/4/2018