The heater should have the correct pressure and fuel type programmed into it. Error Code 57- Malfunction with Burner Overheat Bi-Metal Switch Error Code 52- Issue with Solenoid Valveįix damaged or loose wiring/connections. If this still doesn’t give a proper sensor reading, then you may have to replace it. Repair the broken, damaged, or loose sensor wiring harness. Error Code 41 & 51- Freeze Protection Sensor Located in External Unit Not Functioning If this doesn’t fix the problem, replace the sensor. Measure resistance in the sensor, then clean any scale, fix damaged wiring or loose connections, and remove any blockages restricting airflow. Error Code 34- Combustion Air Sensor FaultyĮnsure the fan is working. Then examine the incorrect resistance or clean the build-up of scale in the sensor. Error Code 33- Heat Exchanger Sensor is Faultyīefore replacing this part, see if there is a loose connection. If it doesn’t clear up the issue, the sensor may require replacing. Therefore, you should measure the resistance, or you can clean scale build-up. You may have a loose connection or damage to the sensor wiring. Error Code 32- Faulty Temperature Sensor Located in Outgoing Water Line Only replace the sensor if it indeed is faulty or the resistance value. Then open a hot water tap to turn the unit back on. Once you are sure the area is safe, turn on the power and gas. Confirm the sensor is not damaged or if there are loose, broken, or damaged connections. Error Code 30 & FE- Flammable Vapors Detected You can tighten or fix the sensor wiring harness or replace the condensate tank that contains the sensor. Solutions for this issue include unblocking the drain line, tank, and condensate trap. Error Code 19- Electrical GroundingĬheck all components of the tankless water heater for an electric short. The heat exchanger should be in a solid-state. If inadequate cold water is coming through the heat exchanger, this will cause the temperature to drastically increase.Ĭheck to see if there is anything in the combustion chamber or scale build-up located in the heat exchanger. If anything is blocking the water flow system or vent system, clear it out. Error Code 14 & 16- Thermal Fuse Reacting to Excessive Temperature Check to see if the venting system is blocked, the gasses vent correctly, and the combustion chamber gets adequate fresh air. See if there is anything that is short-circuiting in the gas solenoid valve and reconnect wiring connections. Error Code 12- Flame Failureįind out if there is any loose wiring on the flame rod, PC board, and power supply. Inspect the gas solenoid valve in case there is a short circuit. Remove all dirt and debris if there is any. Look at the gas burner to make sure it is installed correctly. Automatically, it assumes that there is no air found in the gas line, the grounding is correct, and there are no issues with the gas supply.Ĭheck that the igniter generates a spark and the wiring connections are fine. Rinnai tankless water heaters have an electronic ignition. Properly set the dip/condensation collars and meet all clearances. Make sure there isn’t anything blocking the vents or fan. There should not be a reduction in the diameter and length of the vents. Error Code 10- Reduced/No Air Supply to Water Heater or Obstruction in Flue Gases OutĮnsure the proper Rinnai venting is used and there isn’t anything obstructing the venting system. If the error code is still present, the bypass valve needs replacing. To fix, turn the power off, then back on. The solution is to turn off the water flow for the hot water tap. No water will flow after a power outage has been resolved, so this error will remain on the controller. This error code happens because the temperature controller is used for a bath fill function. Error Code 02- Water heater burner isn’t functioning in freeze protection modeĬall a technician. Then press the arrow up and the previous nine error codes will flash and appear one after the other. Press and hold down the on/off button for two seconds. To find the error code, check the temperature controller. There are more than 25 error codes in all, and they require a great deal of skill and knowledge to repair as they have a very complex design. It will flash at the clock display on the BC-100 and MC-100 units. If it detects a problem, it issues an error code on these models: MCC-91, MC-91, and MC-502. You can use a self-diagnostic tool to inspect how the unit is operating. When an error code is present, a safety feature turns off the unit.
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