Rinnai Tankless Error Codes

    Rinnai Tankless Error Codes

    Tankless Systems are complicated, thus, they can have some errors and electronic issues resulting in Rinnai Tankless Error Codes. We have put together a thorough list of Rinnai error codes to help you diagnose and potentially fix any issues you and your tankless may have.


    If Your Rinnai is acting up and needs help, we have fully qualified specialist available.
    Call (647) 925-1930 if we’re not available please leave a message.


    Rinnai Tankless Error Codes
    CodeFaultSolutionReplacement Parts
    02No burner operation during freeze protection modeService Necessary Call (647) 925-1930Not Applicable
    03Power interruption during use now water will not flow when power returns.Turn off all hot water taps. Press ON/OFF twice to reset or unplug for 30 seconds and plug unit back in.Not Applicable
    10Air Supply or Exhaust Blockage1. Ensure Rinnai approved venting materials are being used.
    2. Check that nothing is blocking the flue inlet or exhaust.
    3. Check all vent components for proper connections.
    4. Ensure vent length is within limits.
    5. Ensure condensation collar was installed correctly.
    6. Verify dip switches are set properly.
    7. Check fan for blockage.
    Standard Vent Kit
    All Weather 21″ Vent
    All Weather 12″ Vent
    11No Ignition1. Check that the gas is turned on at the water heater, gas meter, or cylinder.
    2. Ensure gas type and pressure is correct.
    3. Ensure gas line, meter, and/or regulator is sized properly.
    4, Bleed all air from gas lines.
    5. Verify dip switches are set properly.
    6. Ensure appliance is properly grounded.
    7. Disconnect EZConnect or MSA controls to isolate the problem.
    8. Ensure igniter is operational.
    9. Check igniter wiring harness for damage.
    10. Check gas solenoid valves for open or short circuits.
    11. Remove burner cover and ensure all burners are properly seated.
    12. Remove burner plate and inspect burner surface for condensation or debris.
    Not Applicable
    12Flame Failure1. Check that the gas is turned on at the water heater and gas meter.
    2. Check for obstructions in the flue outlet.
    3. Ensure gas line, meter, and/or regulator is sized properly.
    4. Ensure gas type and pressure is correct.
    5. Bleed all air from gas lines.
    6. Ensure proper Rinnai venting material was installed.
    7. Ensure condensation collar was installed properly.
    8. Ensure vent length is within limits.
    9. Verify dip switches are set properly.
    10. Ensure appliance is properly grounded.
    11. Disconnect keypad.
    12. Disconnect EZConnect or MSA controls to isolate the problem. Replace if necessary.
    13. Check power supply for loose connections.
    14. Check power supply for proper voltage and voltage drops.
    15. Ensure flame rod wire is connected.
    16. Check flame rod for carbon build-up.
    17. Disconnect and reconnect all wiring harnesses on unit and PC board.
    18. Check for DC shorts at components.
    19. Check gas solenoid valves for open or short circuits.
    20. Remove burner plate and inspect burner surface for condensation or debris.
    Rinnai Cable Connect
    14Thermal Fuse1. Check gas type of unit and ensure it matches gas type being used.
    2. Check for restrictions in air flow around unit and vent terminal.
    3. Check for low water flow in a circulating system causing short-cycling.
    4. Ensure dip switches are set to the proper position.
    5. Check for foreign materials in combustion chamber and/or exhaust piping.
    6. Check heat exchanger for cracks and/or separations.
    7. Check heat exchanger surface for hot spots which indicate blockage due to scale build-up.
    8. Refer to instructions in manual for flushing heat exchanger.
    9. Measure resistance of safety circuit.
    10. Ensure high fire and low fire manifold pressure is correct.
    11. Check for improper conversion of product.
    Rinnai Flush Kit
    16Over Temperature Warning1. Check for restrictions in air flow around unit and vent terminal.
    2. Check for low water flow in a circulating system causing short-cycling.
    3. Check for foreign materials in combustion chamber and/or exhaust piping.
    4. Check for clogged heat exchanger. Flush system if necessary.
    Rinnai Flush Kit
    32Outgoing Water Temperature Sensor Fault1. Check sensor wiring for damage.
    2. Measure resistance of sensor.
    3. Clean sensor of scale build-up.
    4. Replace sensor.
    Multimeter to test resistance of sensor
    33Heat Exchanger Outgoing Temperature Sensor Fault1. Check sensor wiring for damage.
    2. Measure resistance of sensor.
    3. Clean sensor of scale build-up.
    4. Replace sensor.
    Multimeter to test resistance of sensor
    34Combustion Air Temperature Sensor Fault1. Check for restrictions in air flow around unit and vent terminal.
    2. Check sensor wiring for damage.
    3. Measure resistance of sensor.
    4. Clean sensor of scale build-up.
    5. Ensure fan blade is tight on motor shaft and is in good condition.
    6. Replace sensor.
    Multimeter to test resistance of sensor
    52Modulating Solenoid Valve Signal Abnormal1. Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
    2. Measure resistance of valve coil.
    Multimeter to test resistance of valve coil
    61Combustion Fan Failure1. Ensure fan will turn freely.
    2. Check wiring harness to motor for damaged and/or loose connections.
    3. Measure resistance of motor winding.
    Multimeter to test resistance of motor
    65Water Flow Control Fault1. 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.
    2. Contact a qualified or licensed contractor to service the appliance.
    3. Toronto and Area (647) 925-1930
    Not Applicable
    71SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault1. Check wiring harness to all solenoids for damage and/or loose connections.
    2. Measure resistance of each solenoid valve coil.
    Multimeter to test resistance of each solenoid
    72Flame Sensing Device Fault1. Ensure flame rod is touching flame when unit fires.
    2. Check all wiring to flame rod for damage.
    3. Remove flame rod and check for carbon build-up; clean with sand paper.
    4. Check inside burner chamber for any foreign material blocking flame at flame rod.
    5. Measure micro amp output of sensor circuit with flame present.
    6. Replace flame rod.
    Not Available
    LCScale Build-up in Heat Exchanger (when checking maintenance code history, “00” is substituted for “LC”)1. Flush 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.
    Rinnai Flush Kit
    No codeNothing happens when water flow is activated.1. Clean inlet water supply filter.
    2. On new installations ensure hot and cold water lines are not reversed.
    3. Check for bleed over. Isolate unit from building by turning off hot water line to building.
    4. Isolate the circulating system if present. Open your pressure relief valve; if water is flowing, there is bleed over in your plumbing.
    5. Ensure you have at least the minimum flow rate required to fire unit.
    6. Ensure turbine spins freely.
    7. Measure the resistance of the water flow control sensor.
    8. Check for DC shorts at components.
    Multimeter to test resistance of sensor
    Water Filter Assembly
    No WiFiWiFi not working1. Check Wifi module and connections.
    2. Replace Wifi or install WiFi system
    Control-R Wi-Fi Module
    Wi-Fi Module