Turn off the device and examine the APSs condition. An open or short thermistor can be the root cause of this problem. This number indicates that the water pressure is high. Exhaust Overheat: exhaust limit switch shuts down the unit. An open or shorted sensor causes this issue. Most of those PRVs are factory set at 12 psi (although you can adjust them.) It informs you that the exhaust is overheating. An example of data being processed may be a unique identifier stored in a cookie. To troubleshoot Navien error code E109, check and clean, if necessary, the air intake filter and the fan motor. A place for homeowners, renters, tenants, business owners or anyone with a general question about their HVAC system. Recently, in the summer, error code E351 happened once, then I open the auto feed valve to make up some water, the unit works again. To fix it, check the thermistors condition and wiring. Protect the water supply and water heating equipment with eco-friendly water treatment solutions. 2.) Call for service if needed. I bled the system and now its at 10.2 PSI cold/inactive and 17.2 PSI when running. Navien error code E127 is indicative of a problem with the air pressure sensor (APS). Damage wiring to the thermistor at the hot water outlet can also create this problem. Make sure the exhaust pipe is not obstructed. Scan this QR code to download the app now. Other Troubleshooting Tankless Water Heater Error Code Guides, Error Code E001: Heat Exchanger Overheating, Error Code E002: Low Pressure on the Heating Side, Error Code E011: High Pressure on Heating Side, Error Code E016: Heat Exchanger Overheating, Error Code E030: Abnormal Exhaust Temperature, Error Code E047: Exhaust Thermistor Error, Error Code E060: Dual Venturi Limit Switch Error, Error Code E109: Fan Motor Activity Error, Error Code E127: APS Error (Open, Short, Initial Value or No Response), Error Code E205: H/E Outlet Error: Thermistor Open or Short, Error Code E218: H/E Inlet Error: Thermistor Open or Short, Error Code E302: Low Water Pressure Error, Error Code E352: High Water Pressure Error, Error Code E353: Water Pressure Sensor Error, Error Code E407: Hot Water Outlet 1: Thermistor Open or Short, Error Code E421: Cold Water Inlet 1: Thermistor Open or Short, Error Code E432: Cold Water Inlet 2: Thermistor Open or Short, Error Code E434: Abnormality in Water Adjustment Valve, Error Code E438: Abnormality in Circulation Pump, Error Code E441: Hot Water Outlet 2: Thermistor Open or Short, Error Code E480: External Tank Thermistor Open or Short (System Boiler Thermistor Setting Only), Error Code E517: DIP Switch Setting Error, Error Code E594: Partial PCB Communication Error, Error Code E736: Abnormal Cascade Communication, Error Code E782: Main Panel Communication Error, Error Code E783: OT-remote Controller Error, Error Code E785: Abnormal Flow Switch Operation, overwhelmed your tankless water heaters capacity, Easy Maintenance Tips for Tankless Water Heaters w/Photos, battery backup power supply for your tankless water heater, heating supply thermistors condition and the pump, Can Water Heaters Be Installed Outside: What You Should Know, Troubleshooting Tankless Water Heater Error Codes: Rinnai, Troubleshooting Tankless Water Heater Error Codes: Rheem, Troubleshooting Tankless Water Heater Error Codes: Navien, Troubleshooting Tankless Water Heater Error Codes: Noritz, Troubleshooting Titan Tankless Water Heater Problems, Troubleshooting EcoSmart Tankless Water Heater Error Codes, Troubleshooting Tankless Water Heater Error Codes: Bosch. Next, check the resistance of the high limit switch. It means there is some issue with a water pressure sensor. You may also need to restart the unit to fix this error code. All Navien Products. Navien error code E445 indicates an abnormality in the mixing valve. FIX:Turn off the water heater for 30 minutes and restart. The unit generally pops this fault code on the display if you dont plug the unit into a properly grounded electric outlet. Navien error code E004 is an indication that the unit is detecting a false flame. Then, pull out the cold water inlet filter from the unit and clean it. When the exhaust gets excessively hot (flue temperature exceeds 149 F), your water heater will shut down automatically to avoid further damage. Navien error code E001 is caused by an overheating heat exchanger. In that article, I broke down every step to troubleshoot the unit for the error code e438. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. In just today. To troubleshoot the Navien error code E782, inspect the condition and operation of the PCB. It happened suddenly so I don't think it scale buildup, I already cleaned the water filter for the unit. It tells you about the abnormality of the external tank thermistor. [Gas, Electric, Tankless Water Heaters Complete Guide 2021]Continue, What are the cons of a tankless water heater? When they both stop working, it indicates that there is some major issue with the device itself. Press the reset button to reset your device. It may not display this or other websites correctly. However, if the air pressure goes out of range, you cant ignite the unit and the code E110 will appear on the front panel display. You will have to replace the heat exchanger because it cannot be fixed. Navien error code E740 means there is a problem with the outdoor temperature sensor. I highly recommend you contact the Navient Technical Support Team at 1-800-519-8794. You also have to flush the heat exchanger. I know that indicates low pressure - However, here is when things get tricky. If your Navien displays an error code E060, you need to check the dual venturi connection. I highly suggest you check the thermistor wiring on both cold water inlet1 and 2. Navien error code E594 indicates a partial PCB communication error or an EEPROM error. No new boiler costs just yet! It isn't uncommon for it to go up a bit when the boiler fires, but most of the expanding water should end up in the ET, and the pressure not rising much. Our complete guide to pressure issues in boilers is a great place to start. When the heat exchanger starts to crack, it means there is a gap, and destructive exhaust gasses could enter your residence. If the PCB is at fault, replace it. Well, it is a logical query if your unit is powered by propane fuel. You are using an out of date browser. If the auto feeder valve is open for 5 minutes and it supplies water to the unit, your water heater will detect the error code E351. But, Read More How Much Propane Does A Tankless Water Heater Use? If your device is not working correctly and not displaying any error code, you can reset it. If your Navien tankless water heater displays an error E760, this means that you need to flush the heat exchanger. CODE:E441PROBLEM:Thermistor open or short circuited (hot water inlet 2). Navien Condensing Boiler Domestic Hot Water Ratings; Model 1 NFC-250/200H; Input Ratings: Min: 13,000 BTU/h: Max: 210,000 BTU/h: Other Domestic Hot Water Specifications; Was it enjoyable? Yes its a combi boiler and I get my hot water + heat from it. Measure the pressure sensors output voltage and ensure it is within range. Besides, the flame rod will fail to detect a flame if it gets covered with dirt, mineral deposits, or scale build-ups. What Is A Thermocouple? If you have no hot water, you may have overwhelmed your tankless water heaters capacity or have at least one error code. Next, remove the air filter and clean it by running clean water. When you have problems with your Navien boiler, its a priority to get it working as quickly as possible and without too much expense. The error code E736 informs about the issue in cascade communication, and error code E740 indicates that the outdoor temperature sensor is not working correctly. Navien boiler error codes Navien is a manufacturer of various universal energy equipment in Korea. He obtained his Bachelor of Science degree from the University Of Texas at El Paso. If any particular ad is your REASON for blocking ads, please let us know. When buying a tankless water heater, we hope you find this guide helpful and will bookmark it for further reference. Turn off the device for 30 minutes and then restart it. You can contact a plumber if necessary. To fix it, check the thermistors condition and wiring. Error code e.003. Ensure there are no loose connections and the wiring is not damaged. Then, reinstall the filter and secure it with the screw. CODE:E004PROBLEM:False flame detection. And finally, verify the wire connection between the fan motor and the PCB is secure. Locate the reset button on the heaters front control panel. If your Navien display reads out that you're at 31.5 psi, you're a prime candidate for your pressure relief valve to start spitting, and that could get you back to where you started. Take the note of the standing system pressure displayed on the front panel. All Plumbers are screened, licensed, and insured. You will be able to take action to resolve it at the right time. This issue frequently occurs in older models. The Navien boiler error code e302 also relates to low pressure in your system. Remove the intake filter and properly wash it using a brush beneath running water. It means the heat exchanger is overheated. CODE:E736PROBLEM:Abnormality in cascade communication. I just turned on the heating on the second floor again and 15 minutes into it, couldn't feel the heat. Why Is My Liberty Pump Pro 380 Not Working? My Navien keeps at 13.7 psi (cold) and bumps up to about 22 psi when the boiler is firing. You have heard the rants and raves of tankless water heaters being so much more efficient, cost effective, and easier to maintain. First off, inspect the check valves and ensure its operating properly. An open or shorted sensor causes the Navien error code E441. If there is any issue in the internal circuit of the PCB, your Navien unit will display E515 on the front panel display. CODE:E434PROBLEM:Abnormality in water adjustment valve. This is a complete guide on Navien Tankless Water Heater Error Codes. To fix the issue, you should either replace the recirculation pump or purge the air out of the pump. This error code is not an error code per se but rather a reminder. Just today. The limit control is a safety feature, which is also known as a high limit control switch. CODE:E110PROBLEM:Abnormality in air pressure. So, detach the grounding from the grounding terminal inside the unit and ensure the PCB is working normally. E046 2 Abnormal heat exchanger thermistor Auto RESET. Abnormal operation: input and memory Call or Text Blue Conservations trained Navien specialists at 484-469-0718. If the wiring is okay, you must replace the water adjustment valve. | Home Improvement 2022, How To Turn On Water Heater? If the error code persists after a reset, you may need to replace the APS.
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