What it Means: Water temperature is too high. 9. Sediment or lime build up on element(s). ... American Water Heaters Troubleshooting Guides Residential / Commercial. If you take the matter in your own hands, you run the risk of voiding any applicable warranty. An open or shorted sensor causes the Navien error code E407. Navien error code E517 signifies a problem with the dip switch. I started HomeInspectionInsider.com to help people better understand the home inspection process and answer questions about homeownership and home maintenance. Navien error code E439 is indicative of a problem with the flow sensor. Turn off, or remove circulation pumps (unit is not designed for continuous operation with circulation systems). A large number of people choose to replace the RV water heater with tankless. To fix this error, you may need to have a licensed contractor assess your unit’s condition and replace the PCB if necessary. 2. 929 East 41st St. PO Box 4200 Check the unit’s PCB for any damage or wiring issues. Error code 031 (green LED flashes only once) Navien error code E432 is a sign of a problem with the cold water inlet 2 thermistor. Everyone uses electricity daily. Replace the thermistor. Telephone: (800) 845-6524. Bosch Tankless Water Heater Error Codes. Replace with larger heater. This error code can be caused by condensate blockage as well. To troubleshoot this error code, check the water supply and circulators, the flow sensor, and the pump. Austin, TX 78765-4200 Navien error code E353 indicates a problem with the water pressure sensor. Navien error code E218 means there is a problem with the operation of the heating return thermistor. This error code involves a breakdown in communication between two tankless water heaters using the Quick Connect Cord. 10. Correct plumbing connections. Navien error code E002 means there is low pressure on the heating side. An open or shorted sensor can cause Navien error code E353. Navien error code E441 is a sign of a problem with the hot water outlet 2 thermistor. ... Tankless. Switch the tankless water heater off and inspect the condition and wiring of the valve. How to Fix: Since this is most often caused by hard water or scale buildup, a descaling procedure should be performed. HomeInspectionInsider.com is owned and operated by Hubert Miles is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. If necessary, replace the thermistor. My Rheem tankless water heater will run a minute and kick off putting out the 13 code. Turn the power to the tankless off. Ensure the flow rate and the PCB voltage at the pump are within spec and that the water circulates properly. Bosh fault code 11 – Indicates a problem with the tankless water heater’s ignition. Noritz Error Code F76. We strongly encourage you to hire a licensed plumber to perform the diagnostics and physical troubleshooting of your tankless water heater. In Easy Maintenance Tips for Tankless Water Heaters w/Photos will outline how to perform tankless water heater flushing and other maintenance. Have questions, or need some help with a Ruud tankless product? An open or shorted sensor causes the Navien error code E421. Error Code E002: Low Pressure on the Heating Side. The first code is E001. To reset the code afterwards, unplug the water heater for 20 seconds and plug it back in. Repeated LC codes will eventually lockout the water heater. If you live in an area that experiences routine blackouts or power failures, you may need to look into a battery backup power supply for your tankless water heater. Although the tankless water heater, also known as continuous flow, makes up only a small percentage of all water heaters sold, it is a growing market. To troubleshoot and fix Navien error code E012, confirm that the main gas valve is open and the gas pressure is within spec. If your Navien displays an error code E352, you need to check the water pressure is within good rangers and check the activity of the feeder valve and the water pressure relief valve. Navien error code E002 means there is low pressure on the heating side. To fix this error code, inspect the heating return thermistor’s condition and the pump wiring connectors. Tankless water heaters cost a bit more, however continuous flow heaters can last as much as twice as long as conventional water heaters. You may also need to check and adjust the anti-short cycle timing as it can also cause an error code E012 in some instances. Before calling a licensed plumber, check to make sure your gas valve is open and supplying gas to the unit. Check the sensor’s connectors to ensure they are installed correctly and are not wet. We have a how-to guide for tankless water heater maintenance. Error Code 16. Navien error code E110 means there is an exhaust blockage. If needed, replace the sensor. 8. Bad combustion means the unit is not burning properly; either you have an issue with air, gas, or venting. To fix it, check the thermistor’s condition and wiring. Remove heating element(s) and check for lime build up. Temper water to heater. Rinnai is known for their innovative tankless water heaters, such as the RUCS65iN and the RUR98iN. Navien error code E001 is caused by an overheating heat exchanger. Is there a reset but … read more Check water flow sensor (may be jammed) P1 Maintenance Warning: Water Flow Too Low (Unit Will Still Be Operable; Minimum Flow 0.4 GPM To Activate @ 35o ) … Navien error code E438 means there is a problem with the circulation pump. If needed, replace the controller or the sensor. To operate the water heater temporarily until the heat exchanger can be flushed, push the On/Off button on the temperature controller 5 times.