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

Most Common Navien Tankless Water Heater Error Codes and How to Fix Them
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Technology is finicky, and tankless water heaters are no different. Over the course of your Navien tankless water heater’s lifespan, you’ll likely run into more than one error code. Don’t worry, though, as error codes are more common than you’d think.
We’ve been servicing tankless water heaters for over 15 years, and Navien is one of our partner brands. Having a relationship with Navien gives us special insight into what makes these tankless water heaters tick, and that includes diagnosing and addressing common error codes.

[@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?

[@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.

[@FORD150-5.4]

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

[@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

[@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.

[@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

[@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?

[@captnobvious31]

Error code E348 ?

[@tajdidajman4889]

Aii how about abnormal pcb connections

[@manuelherrera4085]

Ihave Error code E001 from navien cnobi boiler NCB 240

[@buddyhawkings]

Why does mine only heat when the furnace is on.

[@RedRandom23]

I keep getting error 001

[@barbarapellerito3798]

Error code 026

[@manuelherrera4085]

error code E001

[@RayTheMickey]

Call a technician...

[@Charlemainge]

003

[@ahskeetskeet1]

Ignition failure

[@pickledweed]

Man, we've had E127 twice in under a year. We called someone to come out sometime tonight but it's so annoying. It sounds like the little engine that can't until the error appears lol.