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Rinnai Error Codes

Rinnai - Tankless Water Heater Error Codes

Error Code
Description

NO Code
Nothing happens when water flow is activated
● Clean inlet water supply filter. Be sure to turn off water to the unit
● Verify you have minimum flow rate needed to fire the unit
● Make sure hot and cold water valves are open
● Make sure hot and cold water lines are not reversed

Error Code 00 or LC
Scale build up in heat-exchanger Don’t ignore this code just because it still allows the tankless water heater to continue running. Excess scale build-up can irreparably damage the Heat Exchanger.
● Flush the heat exchanger according to the instructions in the owner’s manual.
● Replace the heat exchanger.

Error Code E02
No burner operation during freeze protection mode. 

Error Code E03
Power interruption during bath fill (Water will not flow when power returns)- Turn off all hot water faucets/taps. Press On/Off button twice.

Error Code E05
Bypass Servo- Turn off power supply to unit, reapply power. Fire up unit. If code 05 reappears replace the bypass valve.

Error Code E10

Air Supply or Exhaust Blockage - Inspect the entire vent system inside/outside the installation location. Check for clearance issues, improper venting or materials used, etc.
Inspect the vent system to ensure all clearances around vent terminations were met. Improper clearances will result in re-circulation of combustion gasses.
Verify vent terminals are installed with the proper clearance from overhangs, grade, obstructions, walls, porches, etc. See venting instructions for proper clearance requirements.

The Fan may be blocked or no longer working.
If the error code 10 still shows, call or text Blue Conservation at 484-469-0718.

Error Code E11
No Ignition This is often a gas issue.
● Is the gas on? You can confirm by turning on another appliance
● Has the unit been running without issue for some time? What could have changed? Has there been construction in the area that could have impacted the gas pressure? ● Disconnect EZConnect™ or MSA controls to see if you can isolate the problem.
● Ensure the igniter is operational. Check the wiring harness for damage.

If you are not familiar with both wiring and gas, you should call or text Blue Conservation at 484-469-0718 to address a Code 11.

Error Code 12
Flame failure This can be gas, air, or spark. Review the Code 10 Checklist. If those don’t address the issue continue to the following.
● Check the power supply. Any loose connections?
● Is the flame rod wire connected? Any problems with carbon build up on the flame rod?


If you are not familiar with both wiring and gas, you should call or text Blue Conservation at 484-469-0718 to address a Code 12.

Error Code 14
Thermal fuse or Overheat  Code 14 is an indication of overheating and should be taken seriously. You can check the following to help address the issue
  • Check for air flow restrictions.
  • Is water pressure low? This can cause problems related to short-cycling and overheating.
  • Flush the heat exchanger following the instructions on the owner’s manual.
  • Check dip switches.
  • Obstructions can cause problems with thermal fuse function. Check the venting to make sure there are no obstructions.
  • Inspect the exterior of the heat exchanger. Is there any scale buildup, Does the heat exchanger look worn, discolored, or damaged
  • Inspect all the components in the cabinet for signs of excessive heat damage.

Error Code 16
Over temperature warming (Safety shutdown because unit is too hot) This is caused by a poor airflow.
  • Make sure that the combustion chamber, exhaust piping and heat exchanger are clear.
  • This could also be a result of poor water flow. Flush the heat exchanger following instructions in the owner’s manual.

Error Code 19

Electrical Grounding  All components should be checked for an electrical short by a qualified Technician.

Error Code 25

Condensate Trap Error  Condensate Trap is full- Check drain for blockage

Error Code 31

Burner Sensor Error  Measure resistance of sensor and replace if needed

Error Code 32

Outgoing Water Temperature Sensor Fault  Check sensor wiring for damage and clean scale build-up. If needed replace the sensor

Error Code 33

Heat Exchanger Outgoing Temperature Sensor Fault  Check sensor wiring for damage and clean scale build-up. If needed replace the sensor

Error Code 34

Combustion Air Temperature Sensor Fault  Check sensor wiring for damage and clean scale build-up. If needed replace the sensor

Error Code 41

Outside Temperature Sensor Check sensor wiring for damage and clean scale build-up. If needed replace the sensor

Error Code 51

Inlet Water Temperature Sensor Check sensor wiring for damage and clean scale build-up. If needed replace the sensor

Error Code 52

Modulating Solenoid Valve Signal Abnormal Check modulating gas solenoid valve wiring harness for loose or damaged terminals. Replace if needed.

Error Code 57

Burner (Bi-Metal Sensors/Thermal Fuse Harness)  Check for continuity through bi-metal sensors located at the top of the heat exchanger at white plastic connector containing red and white wires.

Error Code  58

Secondary Heat Exchanger  There is scale build-up in the secondary heat exchanger. Perform a descaling flush according to the instructions in the owner’s manual.

Error Code 61
Combustion Fan Failure
  • Examine the combustion fan to verify that it can turn freely.
  • Examine all wiring connections for damage.

Error Code 65

Water Flow Control Fault  The water flow control valve has failed to close. Contact a plumber immediately.

Error Code 70
Sensor Harness Connection
  • Confirm that dip switch settings are correct.
  • May need to replace the PC Board

Error Code 71
Solenoid Valve Circuit Fault You probably need to replace the solenoid valve. First:
  • Check the wiring harness to all solenoids.
  • Replace the PC Board

Error Code 72
Flame Sensing Device Fault
  • Check to see if the flame rod is touching flame when the unit fires. Inspect burner chamber for excess buildup.
  • Examine flame rod wiring for damage.
  • Clean the flame rod with sandpaper.
  • Replace flame rod.

Error Code 73

Burner Sensor Circuit: Check sensor wiring and PC Board for damage and replace sensor if needed.

Error Code 79

Water Leakage Detected

  • Turn off water and gas supply and disconnect power to the unit.
  • Inspect the unit for a leak and dry area around the moisture sensing element.
  • It is important to determine the source of the water