Most Common Navien Tankless Water Heater Error Codes and How to Fix Them

[@justcurious8263]

Great video. I’ve had code E012 a few times. Had the igniter rods replaced. Happened again and Navien had my tech adjust the gas valve. 12 months no problem. Problem just happened again. I’m wondering if it’s possible to confirm gas pressure by having pressure gage installed so we can read it?

[@CatherineDoyle-r6y]

We have a code E.4 5 , still works with hot and cold water??

[@stevegraves2968]

I wish i would have saw this before we had one installed. High cost and high maintenance. We have had for less then 18 months. Three service calls to date.

[@Maximus091768]

I have two Naviens. One is for the hot water and the other is for baseboard heat. The hot water shows the water temp on the display. The other never shows anything on the display. The baseboard heat comes up but an ecobee thermostat sends me emails that there is a problem with the furnace.

[@minare2024]

How about an abnormal cascade code on the main heater with two side by side heaters when the electricity goes off? It’s an easy 5-6 step fix but Navien stopped helping over the phone. Need someone to make a video about how to reset. Would be so helpful

[@jayh2792]

Hi that’s the 736 code and in the installation and operation Manual under connecting the communication cables will help u troubleshoot that no problem

[@norm7778]

I'm getting error code E 438. Circulator is bad?

[@SomeGuy001]

Same with me. Was you able to fix it?

[@norm7778]

@@SomeGuy001 So a plumber came over and fixed it and I regret not doing it myself. The E 438 code can indicate the circulating pump malfunction per the manual. However, the plumber insisted it was a flow sensor error. He took off the flow sensor (4 screws and 2 leds super simple) and flushed it with some water and cleaned it with a brush. He reinstalled it and it worked. If I need to change the circulating pump, I think I'll do it myself. it's basically 4 -6 screws. Start with the flow sensor and clean it out. Good luck!

[@Edward-nr1fs]

Hi Great video. I did descale and for some reason (I verified 10 times :) all connection is right and pump is pumping water in but it is not coming out from hot side Anything to check? Waited several minutes Nothing

[@nford7043]

Is your unit powered up?

[@CorvetteC6-LS2]

My navien started shut off by itself and come back is shoe code PV.14 ? Can you help me please

[@kelly-do2ry]

I get error 110 every time the temperature goes below -30 .

[@jayh2792]

110 codes are typically exhaust blockage codes and can occur more frequently during cold seasons if ice collects through either of the pvc pipes , or it could be a fan issue or even a condensate line issues

[@hermancm]

It’d be nice if the camera had gone higher to show the intake filter but I can probably figure it out, for my neighbors boiler I’m always having to reset for the pt resident ugh.

[@tajdidajman4889]

Aii how about abnormal pcb connections

[@captnobvious31]

Error code E348 ?

[@norm7778]

E 348 or E438? What model do you have?

[@manuelherrera4085]

Ihave Error code E001 from navien cnobi boiler NCB 240

[@buddyhawkings]

Why does mine only heat when the furnace is on.

[@AtimatikArmy]

So this video tells us we need a technician for every code! Wow, how helpful this video is, lol, what a joke!

[@kirkwilson5900]

These water heaters are also a joke. Even if they're regarded as one of the best, they suck. Im about to throw my second one away. After rebuilding my first one numerous times, this 2nd one isn't gonna trick me again. I'm replacing today with a new tank heater. Error 788-00 code this morning. I'm over it

[@mateo801]

Is it true that Vavien won't even talk to the customer and that homeowners can't buy parts?

[@kirkwilson5900]

I've experienced both. I'm the homeowner and have spoken to them several times and diagnosed my issues and they sent me parts. I've rebuilt my first one a few times, then got to another problem and they'd only communicate with my plumber. I'm now on my 2nd unit after rebuilding my first. I paid full price for this 2nd one and have a new problem. I am ripping this piece of junk off the wall and throwing it over a cliff. And putting in a regular tank water heater today. I don't recommend these water heaters at all. The end

[@mateo801]

@ Thanks for the input. Which model is the one you want to throw off a cliff?

[@kirkwilson5900]

@@mateo801 navien npe-240a2 . I hopefully will be getting a new motherboard shipped to me tomorrow... I have a water softener too inline btw but our city water is pretty hard, not a factor for the motherboard but it did kill my previous ones heat exchanger. From my research the motherboard is a recurring issue.

[@kirkwilson5900]

@@mateo801 I've read that Rinnai's may be one of the better brands. I think they're all just sensitive machines with computers n sensors that monitor everything which is great til something is 1% off then it shuts down.

[@kirkwilson5900]

@mateo801 update. I got the new motherboard in. It took a few on off cycles to stop flashing the same original code...then the ignitor code came on and disabled operation...lol. I pulled the rods n cleaned em, cycle on off a few times then it fired up! Don't celebrate yet...it lasted long enough to have one family member shower, dishes got done and 2 more showers...then end of 2nd shower it shut off again. Same as the first code- motherboard.. 788-00. These things are junk

[@RedRandom23]

I keep getting error 001

[@nerdinside8242]

773-00 after almost 4 years of trouble free use.

[@barbarapellerito3798]

Error code 026

[@manuelherrera4085]

error code E001

[@Charlemainge]

003

[@ahskeetskeet1]

Ignition failure

[@RayTheMickey]

Call a technician...