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Error Codes · Navien

Navien Tankless Water Heater Error Codes

Text us with your make, model, and error code—Blue Conservation will help you troubleshoot fast.

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← All Tankless Error Codes

Blue Conservation services Navien tankless water heaters, combi-boilers, and commercial boilers throughout the Philadelphia region. Use the error codes below for general guidance—then text us with your make, model, and code for faster help.

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Navien Units Covered

Error codes below apply to the models listed. Newer or discontinued models may not be shown.

Residential Tankless—Condensing Models

CR, CR180, CR210, CR240, NR, NR180, NR210, NR240, NR180A, NR210A, NR240A, NP, NP180, NP210, NP240, NP180S, NP210S, NP240S, NP180A, NP210A, NP240A, NPE-150, NPE-180, NPE210, NPE-240, NPE-150S, NPE-180S, NPE-210S, NPE-240S, NPE-150A, NPE-180A, NPE-210A, NPE-240A, NPE-150S2, NPE-180S2, NPE-210S2, NPE-240S2, NPE-150A2, NPE-180A2, NPE-210A2, NPE-240A2

Residential Non-Condensing Models

NPN-160E, NPN-180E, NPN-199E, NPN-160U, NPN-180U, NPN-199U

Heating Only and Combi-Boilers

NHB-55, NHB-80, NHB-110, NHB-150, NCB-190/060H, NCB-190/080H, NCB-240/110H, NCB-250/150

Commercial Grade Boilers and Combi

NFB-175, NFB-175H, NFB-200, NFB-200H, NFC-175, NFC-175H, NFC-200, NFC-200H

Blue Conservation recommends contacting a licensed and trained service technician for troubleshooting and repairs. The information below is presented for informational purposes only, not as guidance or instruction. Customers who remove the cover from any equipment do so at their own risk and responsibility. For service and assistance, please contact Blue Conservation at 484-469-0718 during regular business hours. For members of our Blue Club service plan, feel free to call or text service requests at any time and we will look to respond as soon as possible.

Navien Tankless Water Heater Error Codes

Error codes are for informational purposes only and are not a substitute for professional assistance.
ManufacturerError CodeDescription
NavienError Code E03Ignition FailureEnsure that the main gas supply valve is open.
NavienError Code E04False Flame Detection Ensure that the electrical cord is properly grounded.
NavienError Code E12Flame LossClean the intake air filter.Ensure that the electrical cord is properly grounded.
NavienError Code E16Overheating of heat exchangerTurn off the system for at least 30 minutes, then restart it.Clean the heating return filter.Flush the heat exchanger.
NavienError Code E30Abnormal exhaust temperaturePlease call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address a Code 30.
NavienError Code E46Abnormal Operation: Limit Control Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 46.
NavienError Code E47Abnormal operation: Exhaust Thermostat Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 47.
NavienError Code E60
NavienError Code E060: Abnormal Operation: Dual Venturi Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 60.
NavienError Code E109Abnormal Operation: Fan MotorEnsure that the exhaust pipe is free of obstructions.Clean the intake air filter.
NavienError Code E110Abnormal Air PressureEnsure that the exhaust pipe is free of obstructions.Clean the intake air filter.Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 110.
NavienError Code E205Heating supply thermistor open or short circuit Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 205.
NavienError Code E218Heating return thermistor open or short circuit Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 218.
NavienError Code E351Abnormal Auto feeder valve (boiler make-up water) This error is due to low water pressure within the boiler. It can be a simple fix by adding water to the boiler. Most boiler water pressure should be maintained at between 15 and 18 psi. Sometimes there is a fill valve or lever to add water to a system.Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 351.
NavienError Code E352High water pressure This error is due to high water pressure within the boiler. It can be a simple fix by isolating or draining water to the boiler. Most boiler water pressure should be maintained at between 15 and 18 psi. Please call or text Blue Conservation at 484-469-0718 to schedule a service call with a professional to address Code 352.
NavienError Code E353Abnormal operation: water pressure sensor Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E407Hot water outlet thermistor open or short circuit Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E421Cold water inlet thermistor open or short circuit Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E439Abnormal operation: flow sensor Reset the boiler from the front panel.Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E515Abnormal operation: PCB Ensure that the electrical cord is properly grounded. Reset the boiler from the front panel. Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E517Abnormal operation: DIP switch setting Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E594Abnormal operation: EEPROM Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E615Abnormal operation: input and memory Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E736Abnormal operation: cascade communication Please call or text Blue Conservation at 484-469-0718 to schedule a service call.
NavienError Code E740Abnormal operation: outdoor temperature sensor (appears only when the outdoor reset curve is enabled)Ensure that the outdoor reset curve is configured properly. Check the outdoor temperature sensor wiring connection.This can typically be resolved by updating general boiler settings.
NavienError Code E777Abnormal operation: LWCO Check the LWCO wiring connection.Ensure that the system water level is appropriate. Add make-up water to the system if necessary.
NavienError Code E782Abnormal operation: main panel communication Please call or text Blue Conservation at 484-469-0718 to schedule a service call.

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Emergency Response

Blue Conservation often troubleshoots error codes over the phone, and we do our best to respond as quickly as possible to emergency requests. Response times will vary depending on the nature of the malfunction, time of day (or night), and personnel availability, but we take pride in our customer service and satisfaction.

BLUE CLUB MEMBERS ALWAYS GET PRIORITY SERVICE! Let us know if you are a Blue Club member—members receive priority and expedited services. Learn about Blue Club →

If you are experiencing a boiler, combi, or tankless water heater emergency, text us right away at 484-469-0718.

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Please Include the Following Information

Name and address, including email
Equipment make and model
Description of the problem and any error codes being displayed
Photos of the error code display
Let us know if you are a Blue Club member! Members receive priority and expedited services.

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I thought I was truly in a pickle when my furnace went out around the holidays, and I felt so ridiculous for not having had it serviced in the fall. But Jim got right back to me, and an expert technician came right out, listened to my questions and concerns, and came up with great solutions immediately

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Post installation of our heat pump water heater, Jim was very generous with his time, helping us to understand how to achieve the right balance of saving money while having the right amount of hot water on hand.

Ready to Select and Install Your Tankless Water Heater?

Email service@blueconservation.com or text 484-469-0718 to request a quote or request service. A knowledgeable Blue Conservation team member will help with equipment selection, estimates, and installation scheduling.

Reach Out Anytime We’re Here to Help

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