Navien Tankless Error Codes


This is the Entire list of Error codes for the Navien tankless water heater.

These troubleshooting tips are for models 180, 210, 240, 180A, 210A, 240A, NPE-A, NPE-S.

 

For immediate help give us a call (647) 925 1930 or fill out our quick contact form here

To trouble shoot the systems yourself try our interactive guide. 

We provide sales, support, and maintenance on all Navien Tankless systems throughout Southern Ontario.

If you have any further questions send an email or post in the comments section and we will try to answer all inquiries.

E001 Water is boiling in the Heat Exchanger 1. clean the inlet water straining

2. Check the automatic flow

3. Check the heat exchanger, remove and clean with a solution

E003 Ignition Failure 1. Check to see if the main gas supply is on

2. Check that the power is on

3. Check the igniter for spark

E004 False flame detection 1. Ensure ground wire is connected

2. Check the igniter for spark

E007 Hot water outlet: thermistor -open 1. Check the thermistor

2. Replace the thermistor

E008 Hot water outlet: thermistor -short 1. Check the thermistor

2. Replace the thermistor

E009 Abnormal fan motor activity 1. Check and clean the air filter

2. Check and clean the fan motor

E010 Abnormal Air Pressure 1. Check the vent pipe for obstructions

2. Check and clean the air filter

E012 Flame loss 1. Check the main gas line (valve open?)

2. Check intake air pipe

3. Check the ground wire

4. Check power supply

E015 Abnormal control board 1. Check power supply

2. Check the GFI

E016 Overheating of heat exchanger 1. Turn off the for at least 30 minutes then restart

2. Clean the inlet water strainer

3. Check the automatic flow adjustment valve

4. Check the heat exchanger: remove and clean with a cleaning solution

E021 Cold water inlet: thermistor 1 -open 1. Check thermistor

2. Replace thermistor

E022 Cold water inlet: thermistor 1 -short 1. Check thermistor

2. Replace thermistor

E027 Abnormal activity of the air pressure sensor 1. Check the vent pipe for obstructions

2. Check and clean the air filter

E030 Exhaust overheat: exhaust high limit switch shuts down the unit when the flue temperature exceeds 230F or 110C for more than 10 minutes 1. Turn off the for at least 30 minutes then restart

2. Clean the inlet water strainer

3. Check the water adjustment valve

4. Check the heat exchanger: remove and clean or flush system

E032 Cold water inlet: thermistor 2 -open 1. Check thermistor

2. Replace thermistor

E033 Cold water inlet: thermistor 2 -short 1. Check thermistor

2. Replace thermistor

E034 Abnormal – flow adjustment valve 1. Check the flow adjustment valve
E035 Abnormal activity of the gas pressure sensor 1. Check gas line
E036 Communication failure 1. Contact Navien Tech. support
E037 Water leak inside unit 1. Close cold water main

2. Replace leaking parts

E038 Abnormal circulation pump 1. Check the circulation PUMP

2. Check the water flow sensor

3. Check the cold water main

E039 Abnormal – water flow sensor 1. Check the water flow sensor
E041 Hot water outlet: thermistor 2 -open 1. Check thermistor

2. Replace thermistor

E042 Hot water outlet: thermistor 2 -short 1. Check thermistor

2. Replace thermistor

E043 Abnormal cascade connection 1. Check model type
E044 Abnormal thermistor connection 1. Check thermistor connection
E045 Abnormal – mixing valve 1. Check the mixing valve
E046 Abnormal heat exchanger thermistor 1. Check heat exchanger thermistor connection
E047 Abnormal exhaust thermistor 1. Check exhaust thermistor connection
E048 Abnormal LPG gas pressure 1. Check the LPG gas

2. Fill the LPG gas

E060 Abnormal Operation: dual venturi 1. Check the dual venturi connection
E109 Abnormal fan motor activity 1. Check and clean intake air filter
2. Check and clean the fan motor
E110 Exhaust Blockage 1. Check the exhaust pipe for obstructions
2. Check and clean the intake air filter
E407 Hot water outlet 1: thermistor open or short 1. Check the thermistor
2. Replace the Thermistor
E421 Cold water inlet 1: thermistor open or short 1. Check the thermistor
2. Replace the Thermistor
E432 Cold water inlet 2: thermistor open or short 1. Check the thermistor
2. Replace the Thermistor
E434 Abnormal Operation: Water adjustment valve 1. Contact Technician

 (647-925-1930)

E438 Abnormal Operation: circulation pump 1. External: Ensure all water lines are open
2. Internal: Check two way valve direction
E439 Abnormal Operation: flow sensor 1. Contact Technician 

(647-925-1930)

E441 Hot water inlet 2: thermistor open short circuit 1. Contact Technician

(647-925-1930)

E445 Abnormal Operation: Bypass Mixing valve 1. Contact Technician

 (647-925-1930)

E515 Abnormal Operation: PCB 1. Ensure electrical cord is properly grounded
E517 Abnormal Operation: Dip switch setting 1. Contact Technician (647-925-1930)
E593 Abnormal Operation: Front Panel Key 1. Contact Technician 

(647-925-1930)

E615 Abnormal Operation: input and memory 1. Contact Technician

 (647-925-1930)

E736 Abnormal Operation: Cascade communication 1. Contact Technician 

(647-925-1930)

E760 Flushing Service Alarm 1. Call for system flush(647-925-1930)
E782 Abnormal Operation: Main panel Communication 1. Contact Technician 

(647-925-1930)

There will be error codes on both the remote control and on the computer board on the main unit.

To reset a Navien tankless water heater either unplug the unit and wait a minute to plug it back in again, or press the power button on the remote control off and then back on again.

If you have a NPE-A or NPE-S simply press the reset button on the front panel of your tankless to reset your system. 

 Reset navien tankless water heater

If Nothing else works call Navien’s Tech Support at 1-800-519-8794


Author: administrator

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54 Comments

  1. I have a Navien CR-240A that was installed in 2008. I am getting a lot of water dripping from the bottom of the unit. I have taken several looks at the tubing inside and can find no leaks. I had a plumber check the unit and he said it was normal condensation. I do feel a lot of condensation at the top and bottom of the water tank. I do not recall seeing this much water dripping out of the unit in previous years. I am getting 3 to 4 ounces of liquid dripping from the outside of the unit each day. This does not seem right.

  2. I have a code E003. How should I fix this or does it need to be serviced by a technician??

  3. I have had a Navien Tankless for six months much of it during bitterly cold weather and it has worked fine. On two occasions it shut down and had to be reset after which it started right up. The code was A110, there is no obstruction & the filter is clean. I think that on both occasions there were high winds that blew at the intake and made it read obstruction. I am going to put a small guard without blocking the intake & see if that does it. Anybody else have this problem.

  4. I have 3 Rinnai heaters no problem but a 180 combination boiler by Navies… I had the gas pressure checked 10 times by Superior propane all good….. but I keep getting a flame loss error.. sometimes it works great for a month.. then poof… no idea why…

    FYI had many issues on install 3 years ago I took apart the primary heating loop… found a blocked pex fitting the instalLer didn’t notice… check your flows

    705 698-5646

  5. 210 troubles. again and again.
    No error codes this time. if I unplug the unit and power it back on the display reads U1.13 08.06 then after a few seconds reads 120.
    Flow water and nothing, it does not even attempt to start up, no ignition….just lets water pass through.

  6. I have a navien npe-240a with error code E110 flashing. I know it means exhaust blockage, but I cleaned the partically clean screen, there is no blockage on the exhaust vent and even pulled the u clip plug at the bottom (like navien technical support suggested) still it doesn’t work. I’ve had this thing for 13 MONTHS!!! and this is the 4th time it has stopped working!!! HEEEELLLLLPPPPP!!!!!!

  7. It seems to me a theme here. Naviens not working. I myself have to go on a call right now navien not working. I am sure I won’t be installing any, any time soon. But I have a feeling I will be fixing an awful lot of them. NOT A FAN OF WALL MOUNTED ANYTHING>>………

  8. I have a Navien that is not working. There is a flashing red light on the display and the display is displaying error message 038. After looking up the error message I am to check a number of item: 1. Check the circulation PUMP. 2. Check the water flow sensor and 3. Check the cold water main. How would I go about doing this?

  9. Hi, I have a Navien unit , i have an error message 010E, Is this a cleaning problem? and how do i go about cleaning? Thanks in advance.

  10. I have a Navien CR-180 and I just replaced the water flow sensor about two weeks ago and everything was fine until today, where the internal breaker keeps popping now… any suggestions on this?

  11. getting error code E001 which is water boiling in heat exchanger. Possible fixes – clean inlet water straining; check auto flow; check heat exchanger, remove and clean with solution. Also making chugging thumping sound after I shut the hot water off, Also water constantly running down the internal drain. Could that be from the heat exchanger? One thing I do know is because we have no Navien Techs where I am I have to tear this menopausal cow apart (again) so my family and I can have hot water.

  12. I have a Navien CH240. My house wouldn’t go above 65 degrees when it got real cold (-10) The boiler wouldn’t heat over 160 degrees. Come to find out the wrong board was istalled from the factory.

  13. Good morning,

    The navien has a E03 message displaying. The message came up about a month before it happen again. The repair person came back and replaced the same part and a new one and it still not working. It’s something with the spark. It turns on like it will work and they it shuts off. Please send troubleshooting steps since the part was replaced and the last time it work.

  14. Hi Danny, It can be a bit tricky, it’s probably best to call in a professional. Depending on age you may want to think of getting a flush and service of your Navien NCB.
    If you are in Ontario give us a call. (647) 925 1930

    Take care

  15. I’m currently getting error code E110 – Exhaust Blockage – on my NCB system. The chart above says to check the exhuast pipe and air filter.
    Is this something I check out on my own or do I need to call a professional?

  16. I Have a Navien CR-240(A), serial #9010-20080917-1071.
    I have error code E33 constantly (inlet thermistor – short). I have tried two new Navien correct thermistors and still get the same error code (E33) which would indicate to me that the problem is not with the thermistor, but maybe the circuit board (KDC-321-5M v1.04A), would this be a correct assumption?(unit installed March 2009).
    Thanks

  17. After cleaning out all the filters, I started getting an E10 error code on restart. A technician I talked to over the phone was kind enough to suggest a full white vinegar flush before he would come to see the unit. After running the flush for a good 60 mins, I restarted and we were good to go. A big thank you to Barry.

  18. I would contact your installer, The NCB 240 is the same system I use to heat my house and it works great. Is the system set to provide hot enough water? There are a lot of variable here and I really don’t have much information make any type of firm suggestions.
    Feel free to call us if you have any specific questions (647) 925 1930

  19. just installed the navien ncb 240, it replaced an old old boiler. I reused all the same tube and fin. Now the navien won’t heat the house warmer then 62 degrees.

  20. Our Navien hot water heater/boiler continues to have an Error Code of E002, which is not included in the chart above. For some reason this seems to happen more often when it is very windy outside. Sometimes it will clear & start working again after we unplug it,sometimes not and sometimes after a few minutes or hours it will just up by itself without unplugging.
    Any advice/tips would be greatly appreciated.

  21. I have a navien NR-240 NG with error code 03 e and underneath it has 002 which is not an explained error code in the chart above. What does it mean? The heater runs for a minute or 2 and then stops with red light flashing this error code. Please advise.

  22. Hello there I have a navien C180 model ,when you turn the hot water on I have no presure and no hot water ,and no code comes up can any one help me out!!!

  23. The GFI is switching off, and system must be re set. Why would this be happing?

  24. Hi there,
    I purchased a home with an existing Navien tankless and still some time left on the contract. What we are seeing is error codes 03, and error code 002 almost daily. any idea what that means?
    Is it new injector, motherboards or some other problem.
    I have to unplug and replug to get hot water nearly daily = hassle.
    Never had a problem with my tanked units…

  25. I have had a tankless water heater for just over a year. For the last several months the water would go cold and only way to fix was unplug, but there was no error code. Tonight, my wife was taking a shower so i went down to reset and there was an error code 022 on the remote. Any help on this would be greatly appreciated. For the amount of money i paid for this appliance, i was hoping to get more than just a year before having problems….

  26. This can be a tough question. Unfortunately Navien had a rough few years where their tankless systems were sub par (and thats being nice…). Does the system throw an error code? It could be a number of things causing the burner shutdown. As always you can try giving one of our technicians a call and they can usually diagnose the issue over the phone and help decide what the next steps should be… (647) 925 1930

  27. Hello,

    If you would like to try calling one of our technicians they may have a few ideas that could rectifiy your problem over the phone (647) 925 1930. If that doesn’t work your best bet is to book service for your Navien E022 error.

  28. My Navien gas water heater is reading code E022 on the remote. I have unplugged and pluged several times. The remote will read ok after plugging back but as soon as I start the tap it goes back to code E022. What Do I have to do to correct the problem?

  29. Our navien always always goes full ice cold mid shower. It’s humming loudly downstairs and blinking on the remote. Only way to fix is to unplug and then it will work for awhile again. Second time in 2 years we’ve had issues with this…not sure what to do. Suggestions?

  30. Hi Ken,
    Give us a call at the office 647 925 1930, we have few things we can try over the phone before sending a tankless technican out to your home.

  31. My Navien 210A that was recently serviced for a leak and for correcting gas inlet from 1/2 to 3/4 inch, is not again defective. Water temperature is mostly luke warm but at times it does reach a good heat. When I switch it off from the little switch inside the unit and then on, it gives code U1.51 followed by 09.05 and then the temperature display of 120F. I hope there is a simple solution and I won;t have to call a technician and be set back $175 to $200 to get his service.

  32. I am having this same problem? Did you get an answer on what to do???
    Our Navien 210 is giving us an error code E10. We have checked the pipe for obstructions and cleaned the filter -works for a bit then gives us the error again -each time it quits we check the pipe and the filter and there’s nothing there. If we unplug it and leave it for a bit it works again for very short time. Could the sensor be screwed?? Suggestions?? We are getting very frustrated and thinking of going back to a traditional gas heater.


  33. Jim Weber:

    I have a navien with error code 03 e and underneath it has 002 which is not an explained error code in the chart above. What does it mean? The heater runs for a minute or 2 and then stops with red light flashing this error code. Please advise.

    Hey Jim, did this ever get resolved? I’ve been having the same issue for a year now. At first it was a couple times a week, but now it’s a couple times a day, if not more! I miss my water heater tank. =(

  34. Have you tried turning both the bathtub and facet on to full hot?

  35. installed a Nr 180 natural gas today dec.16/2011 turn on hot water tap and the unit will not fire .what is going on?Open the relief valve and the unit fires. What is going on?

  36. I have been having a problem with my Navien NR-240A. The fault code displayed is 27 which is abnormal activity of the air pressure sensor. I have rebooted the unit several times and the final time I got it working again. I had to kill the breaker to it, and leave it off for a few minutes, then reflash it. Eventually I got it running. This might work for anyone out there with a similar problem.

  37. I have had my Navian R-210-A for about 9 Months. I use propane and constantly get the R048 abnormal gas pressure error code. This thing has crapped out at least 20 times since we had it installed. The tech who installed it has come out numerous times and replaced the regulators and taken pressure readings. All is fine but it continues to crap out. I called the Navian tech number and talked to someone who showed little interest in getting to the bottom of this. He just says get the tech out there again and call tech support with the pressure readings. I am sorry I ever purchased this thing. I have propane which is very expensive and thought this would save money. We love it when it’s working and hate it when the water goes cold half way into a shower.

  38. I am a plumber with over 20yrs residential experience and if I ever want to be be-littled, talk to like I’m a fool, or get treated like an absolute retard, I give the Navien tech department a call. They are the most condescending bunch of pricks I’ve ever dealt with. We’ve installed in the neighborhood of 20-30 units dating back to oct/08 (cr’s, nr’s, 180’s, 210’s, 240’s, etc), and had a call back rate of 100%. And believe me when I tell you, every manufacturers installation instruction was followed EXACTLY and every installation was in a newly constructed home. I’ve had to replace heat exchangers, grey elbows, gas valves, pressure switches, circ pumps, gas valves, flow switches, flow sensors, complete units, I could go on but I need more space. We even had one where it fired fine with one faucet open, open another faucet and the unit would switch off, but gas would continue to flow. Then it would attempt to light again followed by a serious of mini-explosions (WTF?!!!). I phoned the tech line, and after waiting on the phone (you are the….10th….caller in the que) about 1.5 hrs, they proceed to tell me “you most likely installed it wrong”. Now when a customer inquires about a tankless heater, I do my best to talk them OUT of one and into a high efficient tank-type.
    My advice is GET RID OF THE UNIT NOW!! YOUR PROBLEMS ARE JUST BEGINNING!!
    Now

  39. Trying to print off Error codes only allows you to print to Error Code # E009. Required for Technicians.

  40. After reading the questions and answers above, I was a little shocked to find that someone else is having the “Gas” smell out side of their house from the Tankless waterheater. We had the original salesman back to check this and after two or three times of coming and going could NOT find out why this was happening? He then said there was nothing he could do and has not returned since although he did say he would look into it further. We have now had this problem for coming on three years and no sloution. Natural gas IS too expensive to waste but what can we do from here on?? Our other problem at this moment is the 38e message we are getting weith the red light, but again after reading the above, we will try the suggestions to see if it can be rectified.
    I would be very happy to receivea reply by e-mail from you with suggestions about the “Gas” smell.Thank you for you time…
    We have heard a lot of horror stories about the Navien since buying ours and hope that we haven;t made a huge error in purchasing it.

  41. I bought a Navien CR-210A in mid 2009 and just noticed that there is no cold water inlet filter installed. Do you know if some units don’t include this or if the plumber probably ended up with some spare parts after he finished (like the cold water filter) and didn’t say anything. Thanks

  42. update 1/7/11 Heater tends to shut down at night and has to be reset. The last time this happened Tec. support said to recalibrate board. This time we are going to try another board altogether

    just had code 003E on Navien tankless and code 02.00it ended up being the pressure switch for air. this is located at top on right side. the one with one yellow circular sticker. the one with two is on the bottom and is the gas one

  43. just had code 003E on Navien tankless and code 02.00
    it ended up being the pressure switch for air. this is located at top on right side. the one with one yellow circular sticker. the one with two is on the bottom and is the gas one.
    Mohr Heating & Cooling LLC

  44. Why do you ask a online marketing company, call Navien directly and ask them, thats what their tech dept is for.
    1-800-519-8794

  45. Our Navien 210 is giving us an error code E10. We have checked the pipe for obstructions and cleaned the filter -works for a bit then gives us the error again -each time it quits we check the pipe and the filter and there’s nothing there. If we unplug it and leave it for a bit it works again for very short time. Could the sensor be screwed?? Suggestions?? We are getting very frustrated and thinking of going back to a traditional gas heater.


  46. Jim Weber:

    I have a navien with error code 03 e and underneath it has 002 which is not an explained error code in the chart above. What does it mean? The heater runs for a minute or 2 and then stops with red light flashing this error code. Please advise.

    It needs to be serviced by a Navien tech to clear the system. Sometimes unplugging the system will get rid of this error but it will likely pop up again in the near future.

    Call this toll free number and they can explain in full detail. 1-800-519-8794


  47. bill:

    I was replacing a window at a friends house the other day and could smell unburnt natural gas. She informed me that it was comming from the hot water heater. She also said the more it’s used(morning showers) the worse it is. If you can help it would be greatly appreciated

    There is a lot of unknowns here… is it a tankless or conventional tank? is it old or new? I would have the company that installed your unit come out and take a look. Natural Gas too expensive to just be venting outside!!


  48. jaro:


    Joe Hill:

    I have a Navien R210 than is not working. There is a flashing red light on the display and what I believe is an error message 038. After looking up the error message I am to check a number of item: 1. Check the circulation PUMP. 2. Check the water flow sensor and 3. Check the cold water main. How would I go about doing this?

    I would look at getting a service technician in if you are not comfortable with disassembling your Navien tankless water heater.
    The issue could be a number of things, pump jammed or foreign material blocking it.. etc etc.


  49. Joe Hill:

    I have a Navien R210 than is not working. There is a flashing red light on the display and what I believe is an error message 038. After looking up the error message I am to check a number of item: 1. Check the circulation PUMP. 2. Check the water flow sensor and 3. Check the cold water main. How would I go about doing this?

  50. I have a navien with error code 03 e and underneath it has 002 which is not an explained error code in the chart above. What does it mean? The heater runs for a minute or 2 and then stops with red light flashing this error code. Please advise.

  51. I was replacing a window at a friends house the other day and could smell unburnt natural gas. She informed me that it was comming from the hot water heater. She also said the more it’s used(morning showers) the worse it is. If you can help it would be greatly appreciated

  52. The error code we get is E010 which is abnormal air pressure, we got it in the winter because frost was forming, now we are getting it in the summer. The vent and exhaust is right above our airconditioner and I’m wondering if that is what the problem is. This has become very frustrating for us as it is now happening year round and resetting it isn’t working anymore. Could the air being sucked up from the A/C have something to do with it? Could just high winds cause it…

  53. I am getting an error code e21. Troubleshooting guide says to check thermistor/replace thermistor. How do I check it? This is a new install. We had hot water for a few days, but it just stopped working. Any suggestions?

    Thanks!

  54. I have a Navien R210 than is not working. There is a flashing red light on the display and what I believe is an error message 038. After looking up the error message I am to check a number of item: 1. Check the circulation PUMP. 2. Check the water flow sensor and 3. Check the cold water main. How would I go about doing this?

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