Your safety is our #1 priority. Contact Happy Plumbing for further troubleshooting. Our technicians can help you diagnose the problem.
Please note: Your water heater model may use different codes or may provide error codes that are not given here. Therefore you’ll want to consult the manual for your specific heater.
| ERROR CODE | MEANING |
|---|---|
| Rinnai Error Code 02 | No Burner Operation During Freeze Protection Mode. For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service. |
| Rinnai Error Code 03 | Power Interruption During Bath Fill (Water will not flow when power returns). For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Turn off all hot water taps. Press ON/OFF twice. |
| Rinnai Error Code 05 | By-Pass Flow Control. For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Measure resistance values of the bypass flow control. Replace the Bypass flow control device. |
| Rinnai Error Code 10 | Air Supply or Exhaust Blockage For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check that nothing is blocking the flue inlet or exhaust. Check all vent components for proper connections. |
| Rinnai Error Code 11 | No Ignition (Heating Not Turning On) For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check that the gas is turned on at the water heater, gas meter, or cylinder. If the system is propane, make sure that gas is in the tank. Ensure the appliance is properly grounded. |
| Rinnai Error Code 12 | Flame Failure – No Flame For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check that the gas is turned on at the water heater, gas meter, or cylinder. Check for obstructions in the flue outlet. If the system is propane, make sure that gas is in the tank. |
| Rinnai Error Code 14 | The Thermal Fuse Has Been Activated For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check for restrictions in air flow around the unit and vent terminal. |
| Rinnai Error Code 15 | Venturi Control For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 16 | Over Temperature Warning (Safety Shutdown Because Unit is Too Hot) For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check for restrictions in air flow around the unit and vent terminal. Confirm fan motor is functioning correctly. |
| Rinnai Error Code 17 | Venturi Blockage For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 19 | Electrical Grounding For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 21 | Data Transfer Error For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 25 | Condensate Pump (Accessory) Condense Trap is Full For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 31 | Burner Sensor Error For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Measure the resistance of the sensor. Replace sensor. |
| Rinnai Error Code 32 | Outgoing Water Temperature Sensor Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 33 | Heat Exchanger Outgoing Temperature Sensor Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Call for service |
| Rinnai Error Code 34 | Combustion Air Temperature Sensor Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting |
| Rinnai Error Code 38 | Exhaust Thermistor CO Sensor For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check sensor wiring for damage. Measure the resistance of the sensor. The clean sensor of scale build-up. Replace sensor. |
| Rinnai Error Code 41 | Outside Temperature Thermistor Freeze Protection Sensor For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting |
| Rinnai Error Code 51 | Inlet Water Temperature Thermistor (Sensor) For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check sensor wiring for damage. Measure the resistance of the sensor. Clean the sensor of scale build-up. |
| Rinnai Error Code 52 | Inlet Water Temperature Thermistor (Sensor) For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check for blockage of the main servo Check the operation of the main servo The main servo may need to be replaced |
| Rinnai Error Code 54 | High Exhaust Gas Temperature For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Ensure Heat Exchanger fins are clean and not blocked. Confirm inlet water temperature is not too high. Clear the diagnostic code by resetting the main power supply to the water heater. |
| Rinnai Error Code 57 | Burner Overheat Bi-Metal Switch For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting |
| Rinnai Error Code 58 | Secondary Heat Exchanger Sensor For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting There is scale build-up in the secondary heat exchanger and it needs to be flushed to prevent damage. Refer to the flushing instructions in the manual. Hard water must be treated to prevent scale build-up or damage to the heat exchanger. |
| Rinnai Error Code 61 | Combustion Fan Motor Failure For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Ensure the fan will turn freely. Check the wiring harness to the motor for damaged and/or loose connections. Measure the resistance of the motor winding. |
| Rinnai Error Code 63 | Recirculation Low Flow Circulation Flow Rate dropped below 1.3 GPM For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Ensure the bypass plug is removed and the bypass filter is installed. (Crossover Mode) Ensure both the inlet water filter and bypass filter are clean and free of debris. Ensure the Parameter setting are correctly set for recirculation mode. Ensure Pump supply voltage. Ensure air is removed from the recirculation line. |
| Rinnai Error Code 65 | Water Flow Control Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting 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. |
| Rinnai Error Code 70 | PC Board For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check PC board DIP switches for the correct position. Check the connection harness at the connection on the PC board. |
| Rinnai Error Code 71 | Solenoid Valve Circuit Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Replace the PC board. |
| Rinnai Error Code 72 | Flame Sensing Device Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Ensure the flame rod is touching the flame when the unit fires. Check all wiring to the flame rod for damage. Remove the flame rod and check for carbon build-up; clean with sandpaper. Check inside the burner chamber for any foreign material blocking flame at the flame rod. Measure the micro amp output of the sensor circuit with the flame present. Replace the flame rod. |
| Rinnai Error Code 73 | Flame Sensing Device Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Check sensor wiring and PC board for damage. Replace sensor. |
| Rinnai Error Code 79 | Flame Sensing Device Fault For your safety and the health of your equipment, contact Happy Plumbing for further troubleshooting Water has been detected at the bottom of the unit. Turn off the water supply. Check all plumbing internally for leakage. |
| Rinnai Error Code LC, LC10, LC1, LC2, LC2 00 | Scale Build-up in Heat Exchanger (when checking maintenance code history, “00” is substituted for “LC”) 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. Flush heat exchanger. Refer to the instructions in the manual. Replace the heat exchanger. LC0-LC9 indicates that there is scale build-up in the heat exchanger and that the heat exchanger needs to be flushed to prevent damage. Refer to the flushing instructions in the manual. Hard water must be treated to prevent scale build-up or damage to the heat exchanger. To operate the water heater temporarily until the heat exchanger can be flushed, push the On/Off button on the temperature controller 5 times. Repeated LC codes will eventually lock out the water heater. For you safety and the health of your equipment, Call or Contact Silva Mechanical for further troubleshooting Water has been detected at the bottom of the unit. Turn off the water supply. Check all plumbing internally for leakage. |
| Rinnai Error Code SS | (SS) Service Soon (Flush Heat Exchanger) SS is a time-based service indicator set during installation. See section “3.12 Parameter Settings” for additional details on setting and changing the SS indicator. SS indicates that it is time for service. The heat exchanger should be flushed to prevent damage (refer to section Flushing the Heat Exchanger for more information). Hard water must be treated to prevent scale build-up or damage to the heat exchanger. To reset the SS code, push the On/Off button on the temperature controller 5 times in 5 seconds. |
| Rinnai Error Code FF | Maintenance Has Been Performed Indicates a licensed professional performed maintenance or corrected an issue |