Rinnai error code 02 indicates that the burner will not operate while the freeze protection mode is active. Error Code 02: No burner operation during freeze protection mode However, eventually, the water heater will stop working to prevent damage. Pushing the temperature controller’s ON/OFF button five times will allow you to run the water heater even if you haven’t cleaned the heat exchanger. Make sure to treat hard water to prevent scale build-ups in the future. You can find detailed information on cleaning and flushing the heat exchanger in your owner’s manual. ![]() It can be observed alternating between the current temperature setting and the LC error code, accompanied by a beeping sound. Rinnai error code 00 will usually be replaced by LC code, followed by a number between 0 to 9 in the maintenance code history. If this does not work, you may need to replace the heat exchanger. To fix this error code, you need to flush the heat exchanger. Rinnai error code 00 (or LC0, LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8, and LC9) indicates there has been scale build-up in the heat exchanger. A licensed technician should replace any sensitive elements, such as the electronic board or gas valve.Share this post: Error Code 00 (or LC0 through LC9): Scale Build-up in Heat Exchanger If all the above issues are corrected, and the unit is still not operating per specs., the problem might be with the PC electric board and/or gas valve, requiring their replacement.Make sure that the heat exchanger (and space between fins) is clean from debris and dirt, so as the gas burner - to prevent irregular combustion.Check for the proper drainage of the condensate (condensing type).Check for water leaking and excessive moisture as it can lead to corrosion and wet electrical connections.Proper dip switch and gas pressure set up for the high altitude installations.Check the venting system (both intake and exhaust) for blockage.For example, incomplete combustion (not enough fresh air or blockage) leads to incomplete combustion (yellow/red flame instead of blue) and carbon buildup on the flame rods. Always look for the manufacturer's instructions for the correct vent installation, the recommended material, size, length, and proper clearance around the vent.Inspect the flame rod for debris and dirt - clean as needed and replace if there are cracks.Ensure that the flame rod is located correctly and installed tightly in its mounting bracket.Make sure that there is no loose connection in the wiring of the flame rod(s) and that the wiring is plugged into the correct rod.Inspect the igniter and if there is a carbon or scale buildup clean as instructed by the manufacturer.When installing a new element, make sure to install a new gasket too. A loose rod can cause no sparks or create a short if it touches other metal components. The igniter and its ceramic insulation must be securely tightened to the mounting bracket and in the correct position.Verify the correct voltage on the electric board when the unit is in the ignition cycle. If there is no spark, look for the loose, bad, or no connection and the damaged element. Test the unit's igniter for proper work by cycling the unit and checking if there is a spark.Note: As extensive knowledge and skills are needed for any gas work, including the gas license possession, the best is to contact a licensed technician. Ensure that the air is removed (purged) from the gas lines after the installation.There are several causes for the improper gas pressure the gas system was not correctly sized (the manufacturer specs were not met), dirt and debris are present in the system. There must be a proper gas pressure and according to the rating plate.The dip switch on the electronic board must be set for the correct gas type. The gas type must be according to the rating plate found on the unit.Make sure that there is no interruption in the gas supply to the water heater.Combustion chamber with the ignition rods. ![]()
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