Make sure dip switches are set to the proper position. Also, see if there are any foreign materials in the combustion chamber or scale build-up in the heat exchanger.Ĭheck for any cracks and damages on the heat exchanger. If there is not enough incoming cold water through the heat exchanger, the temperature will increase significantly. Solution: Clean the obstructions if you find any in the venting system or water flow system. Problem: Thermal fuse reacts due to excessive temperature. If you require professional repair of the error code 11 or 12, contact an expert. Ensure there is no obstruction in the venting system, that the gas combustion chamber gets enough fresh air, and the unit vents the gases out correctly. Check for short circuits on the gas solenoid valve, reconnect all wiring connections. Clean the flame rod from scale build-up and burner from debris and dirt. Solution: Since your water heater was professionally installed and worked for some time, we will have the same assumption as for the above problem.Ĭheck the loose wiring for the PC board, power supply, and flame rod. Where is the problem if your gas water heater is working and suddenly loses the flame? Problem: Rinnai error code 12 is usually associated with flame failure. Check the gas solenoid valve for the short circuit. Check the gas burner for proper installation and remove debris and dirt if you find any. Make sure that the igniter generates sparks and that all the wiring connections are OK. Solution: It will be assumed that gas type and gas pressure are correct, there is no problem with the gas supply, there is no air in the gas line, and grounding is done correctly. Problem: Rinnai water heaters are equipped with the electronic ignition system, so what went wrong when there is no ignition on the gas burner? Also, ensure that nothing blocks the venting system or fan, requested clearances are met, and the dip switch and condensation collar are correctly set. Solution: Make sure that the recommended Rinnai venting is used, there is no obstruction in the venting system, no reduction in diameter and lengths are per instructions. Problem: Reduced or no air supply to the water heater or there is an obstruction in extracting the flue gases out. If the error code 05 is still there and shown on display, the bypass valve is broken and has to be replaced. Solution: The procedure is simple turn the power OFF, turn the power back ON to fire up the unit. Solution: Turn OFF the water flow on the hot water tap. The error code 03 appears on the controller. Problem: When the BC-100 temperature controller is used for the bath fill function, there will be no water flow when the power resumes after the power outage. Problem: The water heater burner does not operate in freeze protection mode. Keep in mind that two different problems with different Rinnai error codes can be solved using the same procedure. Note: We will assume that your Rinnai water heater was installed professionally by a licensed technician. Press and hold the ON/OFF button for two seconds and press the arrow "UP," and the last nine Rinnai error codes will appear and flash one after the other. You can easily find the most recent error codes if your water heater is connected to MC-91 or MCC-91. You can also buy advanced temperature controllers to get some additional functions. The temperature controller MC-91 is found on Rinnai water heaters as the standard feature, integrated into the front panel, while with the outdoor models is provided with the purchase. Rinnai error codes explained and how to fix the problem Keep in mind that today's modern tankless water heaters, including models from Rinnai, due to the complex design, require a lot of knowledge and skills for the repair of the faulty element.īefore making an expensive service call or spend time and money to fix it, contact a company that will connect you with professional plumbers and provide you with up to 3 FREE Quotes. When the problem is detected, the error code flashes at the temperature display on the following models: MC-91, MCC-91, and MC-502, while it flashes at the clock display on models MC-100 and BC-100. Rinnai water heaters are smart they use the self-diagnostic tool to check the operation regularly. With most error codes, the unit will turn itself OFF. One of the neat features that comes with any Rinnai tankless water heater is the temperature controller, which allows you to set the temperature of the outgoing hot water and see one of many Rinnai error codes that appear when there is a problem. Rinnai water heaters are among the most advanced tankless appliances in North America they are made of quality materials, include advanced features as can be seen in this review, and utilize very sensitive elements. Explore the most common heater's problems and find out how to fix them. How to troubleshoot Rinnai water heaters successfully with the Rinnai error codes.
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