Rinnai RC80E Operation And Installation Manual page 13

Code Fault
16 Over Temperature
Warning
25 Condensate Trap Error
31
Burner Sensor Error
32 Outgoing Water
Temperature Sensor
Fault
33
Heat Exchanger
Outgoing Temperature
Sensor Fault
52 Modulating Solenoid
Valve Signal Abnormal
61 Combustion Fan
Failure
65 Water Flow Control
Fault
70 Sensor Harness
Connection
71
SV0, SV1, SV2, SV3
and SV4 Solenoid
Valve Circuit Fault
72 Flame Sensing Device
Fault
73 Burner Sensor Circuit
Error
LC Scale Build-up in Heat
Exchanger (when
checking maintenance
code history, "00" is
substituted for "LC")
No Nothing happens when
code
water flow is activated.
Remedy
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
Condensate container is full.
Check condensate drain for blockage.
Replace condensate trap.
Measure resistance of sensor.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
The water flow control valve has failed to close during the bath fill function. Immediately turn off
the water and discontinue the bath fill function. Contact a state qualified or licensed contractor to
service the appliance.
Check PC board switches (in the bank of 6 switches, #2 should be on for indoor models and off for
outdoor models)
Check the connection harness at the E connection on the PC board. Outdoor models should have
2 orange cables at #7 and 8 positions. Indoor models should not have cables at these positions. If
this is incorrect then replace the sensor harness.
Replace PC board
Replace PC board.
Ensure flame rod is touching flame when unit fires.
Check all wiring to flame rod for damage.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
Check sensor wiring and PC board for damage.
Replace sensor.
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
NOTE: The LC code is the only error code that will allow the unit to keep running. The display will
alternate between the LC code and the temperature setting. The controller will continue to beep.
The LC code will reset if power is turned off and then on.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for bleed over. Isolate unit from building by turning off cold water line to building. Isolate the
circulating system if present. Open your pressure relief valve; if water is flowing, there is bleed
over in your plumbing.
Ensure you have at least the minimum flow rate required to fire unit.
Ensure turbine spins freely.
Measure the resistance of the water flow control sensor.
Check for DC shorts at components.
Manual - Rinnai Condensing Water Heaters 13