Rinnai RC80HPI - Manual (Page 14)

14 Manual - Rinnai Condensing Water Heaters
Code Fault Remedy
16 Over Temperature
Warning 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.
25 Condensate Trap Error Condensate container is full.
Check condensate drain for blockage.
Replace condensate trap.
31 Burner Sensor Error Measure resistance of sensor.
Replace sensor.
32 Outgoing Water
Temperature Sensor
Fault Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
33 Heat Exchanger
Outgoing Temperature
Sensor Fault Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
52 Modulating Solenoid
Valve Signal Abnormal Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
61 Combustion Fan
Failure Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
65 Water Flow Control
Fault 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.
71 SV0, SV1, SV2, SV3
and SV4 Solenoid
Valve Circuit Fault Replace the PC board.
72 Flame Sensing Device
Fault 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.
73 Burner Sensor Circuit
Error Check sensor wiring and PC board for damage.
Replace sensor.
LC Scale Build-up in Heat
Exchanger (when
checking maintenance
code history, “00” is
substituted for “LC”) 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.
No
code Nothing happens when
water flow is activated. 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 hot 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.