The 1004 was introduced in '98 and its production ended in '07 or '08. A licensed technician should replace any sensitive elements, such as the electronic board or gas valve.No can do on the 1004. 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.Gas installation with the gas regulator.Here is the summary of what can go wrong with your Rinnai water heater and what to look for after the error code 11 shows up on the remote controller. Check out for possible causes that generate the error code 11 on the digital display of the heater, and explore potential solutions. How to troubleshoot and repair Rinnai water heaters when there is no ignition, followed by the error code 11.
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