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Navien must have been sued because they no longer talk with homeowners for very long. Very useful video. thanks.

Thanks for taking the time to work through that process on camera.

You are great MAN! Your video Help me to solve the same problem!!! A man from China thank you so much! God bless you!

Good video. I had the exact problem. When I went to replace the check valve, the top bit was actually broken off, so I had to take out the tee fitting to clear. Added a couple of minutes but easy enough. Keep an eye on the O-rings if you take off the tee.

Thank you for this video. This was the exact problem we were having. The plumber told us it was our shower thermostatic cartridge and charged us over $500 to replace it. We were still having the issues with the water temperature fluctuating and not getting hot. I found your video, ordered the check valve and was able to replace it myself. It fixed the problem THANK YOU!!!!!

I’m a plumber and you helped me haha thank you sir.

I'm buying one of these tonight for 50 bucks it's not working I was wondering did you get yours fixed

Excellent. 100% spot on

Was it displaying 000 after the 3rd sequence? Mine is doing that

Just paid out the nose to have a plumber replace the check valve. Looks like quite a simple replacement that I can do should I need it in the future! Like they say though, you pay for what they know, not what they do. A lot of people may not want to mess with this, but I'm here to learn!

Cant change temp on mine

Thank you so much for the helpful video. The check valve for my Navien NPE-240A failed last year, the plumber charged me ~$500 to diagnose and fix. After only 1 year, the same happened with water being just Luke warm. I watched the video, purchased the valve and replaced it. Work well now. Saved me ~$400. One thing to note is that the check valve purchased from Boston Heating Supply is not the right one for my 2016 NPE-240A or the valve shown in the video ( I purchased and it did not fit). I found the right valve in SUPPLIES DEPOT, part # 30008360A. I got two since this valve seems to have short life of ~1 year.

Great video.... cured my problem. Only 1 issue. Navien wouldn't provide much help to me as a non-licensed plumber. Based on your video, I bought a new check valve and just asked the question of whether it could be the check valve. Technician said could be the problem so I replaced it and problem solved. Thx so much for your video!

My wife had not showered in two days due to long days at work. She did her work out last night and no hot water. Thinking it was the heat exchanger I did a two hour flush but nothing. Did the bypass and viola hot water. My check valve was disintegrated when I pulled it but at least could get half of it back in to stop water from leaking. I ordered the check valve with overnight shipping and will replace it and a few other o rings. I've had my Navien for 7 years and this is first time a part has failed. We have extremely hard water. My wife and family just want to say thank you!!!!!

Wow! Thanks! This was my problem. Removed the check valve from my NPE-240A, it was gunked up and did not move freely with the spring action. Cleaned it with some wd-40 and it loosened up perfectly. The hot water was now able to flow without the mix of the cold. Great info and thanks for the video!

Excellent video. Thanks

Perfect thank you!

Thank you for this detailed walk through!

Thanks for the video, going to follow this tonight and hopefully fix my water heater.

Thank you so much!!! Navien wouldn't talk to me, so I had to call a plumber. The plumber sat on HOLD with Navien for more than an hour and a half and went from number 39 in the queue to number 20 in the queue. I made them leave before they could charge me for another hour. After watching your video, I took out the check valve, cleaned it, and smeared a light coating of silicone grease on the inside O-ring, and it's working beautifully again! You are a life saver!

this helped me immensely, many thanks. In my case, it only seemed to be the shower that wasn't hot enough, the nearby tub always worked great (higher flow). This led us down the expensive but fruitless path of replacing the shower cartridge, which didn't work, then the whole valve, which also didn't do the job. Finally, a $7 part that I installed myself with the help of this video solved it.

Check Valve solved my issue as well. The hot water is also flowing at a higher rate. Thanks!!

I fix these for locals and I have repaired about 100 of them so far. Loosing all 3 motors? I may see motor drive issues but generally it's 1 not all 3 and a low cost Triac i believe a BTA20 or a Diode that opens up. If all 3 check connections by Removing power board form cpu board it is 2 screws top and bottom most likely the pins connecting the 2 boards have corrosion and making poor contact.

Thanks so much for this!! Helped me repair my water heater. Appreciate the in depth explanation!

Thanks! Just fixed mine by removing the valve and cleaning the dirt out of the spring so it can move freely again and putting some o-ring grease on both the o-rings

Great video. It helped me more than anything I’ve found. Thanks

This solved my problem as well! Very helpful. Thank you for posting this!

I thought the fans were 12v. At least some are. Wouldn't want to put 120v to them.

Thank you for being very descriptive on the whole process !!!!

Your ability to explain is great. You helped me solve my problem, where even the plumber could not - they are quick to propose you the most complex solution, where a 6$ replacement part can do it.

These smokers are trash. Currently at an air b&w and this thing won’t work. Really missing my traeger right now

Great info it worked for me thank you. New check valve is on its way.

Love it. Great video. Seeing your jimmy rigged power connector, I think you and I would be best friends lol!

Great video, thank you.

Green mountain grill Davy Crocket. When plugged in the off light is flashing and will not turn on. Anybody experience this?

Navien has notorious name of bad check valve. Owner has high chance to get it! Defective design

This is a very helpful video and very good work explaining everything clearly. I am having the same issue with my Navien NPE-210A2 and I've only had it for 6 months! They are sending me a new check valve.

Great Video! I have to do one tomorrow and was glad to have found a video before i went to do it. thank you so much.

Ive been having trouble with getting to temp, and then holding it. I will set it to 225 it will get there hold for about 5 min. then drop to 190 and then slowly climb back up and repeat.????? seems like everything is working other then holding temp and getting their in a timely fashion

Great video, thank you for posting. Just like the other posters, it saved me a bunch of money and was a very simple fix.

Ya navien..will only troubleshoot a plumber. Homeowner is questions only! There's a 20-minute time limit. I called back because I had one more question I was put on hold and hung up on. I called back again they answered about two questions and hung up on me. Not great customer service at all

Great video and thank you so much! It helped me identifying the issue with my NPE-240. The explanation part was incredibly helpful for ones like me having no technical expertise. The actual replacement part took me just few mins (though I’d urge others to take enough time for draining). Again, thank you!

Super helpful! I have external recirculation piping, but looking at this video and manual I was able to figure that all out and shut the valve while also adjusting the dip switches. NOW MY HEATER WORKS WELL AGAIN!! A happy wife is a happy life! I have a new check valve on order. Much happier to pay for a $5 part vs. $200+ dollar plumber bill to put in a $5 part which is so easy to remove/reinstall. 😀😀😀😀

I removed the check valve and only 1/2 half of the valve came out. Looks like the remaining part is stuck inside. Any idea as to how remove the broken part from the cavity? Thanks

Thank you so much, you save me hundreds $$. The check valve was stuck for me and I clean it out. Works like a charm. Thanks Sir

Thank you for this video! I had the same issue with my Navien NPE 240a right after a copper pipe pinhole leak on the hot water line (maybe one caused the other?). In any case I did a lot of searching on the internet for what the problem might be, and this video was the most helpful result. I ordered part # 30008360A from tanklessparts for $6 + shipping. Once I got it though I chickened out and wanted a licensed plumber to troubleshoot with Navien Support first (they wouldn't troubleshoot with me). Took them only 5 min to notice that the GPM (gallons per min) was not what it should be, and the tech said it could either be the flow sensor or the check valve. The tech also recommended a thorough flush with one of those more expensive products (not just white vinegar), something like Haymaker. I told the plumber I'd get the flow sensor and have him come back to install both later, but after he left I felt the check valve installation was most likely the culprit. Once I removed the check valve it was plain to see the spring was unseated, and there may have also been a bit of the plastic missing too. After installation of the new check valve, my hot water is back to normal! I could have saved a bit of money if I wouldn't have chickened out but oh well. Couple of tips for the installation. I would recommend draining the water from the water heater fully, probably from the bottom drain plug. I tried draining from the service ports but that didn't drain it all the way and I ended up having some water come out after removing the check valve. That was a little scary because it wasn't just a few drops, it was pouring out and I was worried it would damage some electronics or wires. I made sure to dry the area thoroughly with towels and a fan before flipping that internal power switch back on. Second tip is don't forget to remove the cap that the check valve has on it. I know it's a silly tip, but at first I didn't know why the part didn't fit, and then I realized the cap was still on :P

Thank you! I appreciate your good information.

You’re a fucking life saver thank you sir

So helpful!

Thank you so much for sharing this. Wish I had seen this earlier. I would have replaced this myself for my heater and saved $250.