![]() ![]() 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, the bypass valve is broken and has to be replaced. Solution: Turn the power OFF, turn the power back ON and fire up the unit. Solution: Turn OFF water flow on the hot water tap. ![]() There will be no water flow when the power resumes after the power outage, and the error code 03 appears on the controller. Problem: Power interruption during bath fill. Problem: Water heater burner does not operate in freeze protection mode. With most of the error codes, the unit will turn itself OFF.īelow is a list of error codes and possible solutions Error Code 02 While it flashes at the clock display on models MC-100 and BC-100. When a problem is detected, the error code flashes at the temperature display on the following models: MC-91, MCC-91, and MC-502. The Rinnai water heater uses a self-diagnostic tool to monitor its operation regularly. Rinnai water heater error codes, meanings and fixes Once you have verified that everything is working as it should, call a professional to fix the heater. Lastly, check to see if there is an error code.check if the water heater is set to the correct altitude setting.Check to see if the ignitor, flaming road, and heat exchanger are working properly.Make sure plumbing is installed correctly.Ensure that all air was purged from the gas line and after the installation.Check to see if you have gas and if there are any gas leaks.Make sure that gas and water valves are open. ![]() Start by troubleshooting to see if any of the reasons listed below is the culprit and remedy the issue as needed. The water heater will return to normal operation and LC# count returns to 0.Ĭheck this too: Mr Heater Troubleshooting and How to Guide Why is my Rinnai water heater not working? Note: After flushing water heater, the procedure to reset LC codes: Push the two switches (A and B) on PC Board at the same time for five seconds.
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