Calling Navien does not send a technician to your door. A Licensed Professional must first inspect the unit and report the findings to Navien's Technical Support Team, before any warranty repair is approved, per Navien's Warranty Claim Process page. If approved, parts ship to that service provider, usually within 1 business day.
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That report-first model surprises people expecting a manufacturer to dispatch its own crew. Support runs Monday through Friday, 5 a.m. to 5 p.m., and weekends and holidays, 5 a.m. to 1 p.m. Pacific, per the same warranty page. Customer Care instead checks warranty status using the unit's serial number, a 15 to 16 digit number between two barcodes on the unit's right side. A full unit swap returns the defective unit to the original distributor with an RGA number from Technical Support, and labor is claimed separately, after the parts or unit claim is approved.
Three things void a Navien water heater's warranty on their own: buying the unit online or through a distributor Navien has not authorized, having it installed by anyone other than a licensed installer or outside the installation manual's steps, and skipping the maintenance the unit needs, per Navien's NPE Warranty page.
Navien states the first point at the top of its warranty document: a purchase through the internet or other e-commerce channels voids the warranty regardless of installation or maintenance, per its Resale Policy. The same page lists misuse and running the unit outside recommended settings as a separate reason a claim can be denied.
| What voids coverage | Source |
|---|---|
| Internet or e-commerce purchase, or purchase through an unauthorized distributor | Navien Resale Policy |
| Installation by a non-licensed installer, or skipping the installation manual's steps | NPE Warranty page |
| Skipped maintenance, misuse, or settings outside those recommended | NPE Warranty page |
Source: Navien, NPE Warranty Information, accessed August 2026. None of these three are about the unit's age or model. They are about paperwork and who touched it, which is what an authorized service provider gets right by default.
Navien's own registration page does not state that registration is mandatory to keep the base warranty active. What it does state is dated and specific: certain water treatment products installed inline with the unit after October 10, 2024 add one more year to the labor warranty, but only if the product is registered, per Navien's Product Registration page.
Registering at www.navieninc.com/register also puts your serial number, installation date and purchase details on file before you need them. That is the same information Technical Support asks for when checking coverage by phone, so having it on file beats searching for a sales receipt once the unit stops producing hot water. Registration takes a few minutes and does not require a service call.
Navien runs its own locator at www.navieninc.com/installers, searchable by address and a 5 to 100 mile radius, filtered by residential or commercial and by installation or service, per the locator page. It is worth checking even if you already have a plumber in mind, since Navien's warranty voids on units sourced through a distributor it has not authorized.
A general local plumber can be fully licensed and still not be a listed Navien installer, since the two credentials differ. Becoming a listed Navien Service Specialist requires completing Navien-led training classes, per Navien's Become an NSS page.
Navien is explicit about the limits of its own endorsement: listed installers are independent businesses, not employees or representatives of Navien, Inc., and Navien assumes no responsibility for the services any installer performs, per the locator page. Being listed narrows the field to people trained on this equipment. It does not replace checking reviews and license status the way you would for any contractor.
No, Navien's US lineup is not tankless-only. Alongside its NPE, NHW and NPN tankless series, Navien sells the NWP500, a heat pump water heater that stores hot water in a tank, in three sizes: NWP500-50, NWP500-65 and NWP500-80, per Navien's residential water heaters page.
That distinction matters for repair, because storage tank and tankless units fail differently. A tankless unit displays a lettered-and-numbered error code on its front panel, while a heat pump storage unit behaves more like a refrigerator with a tank attached, with its own compressor and defrost cycle that can go wrong instead. The process on this page, the report-first claim model, registration and the installer locator, comes from the same Navien pages regardless of which product you own.
If repairing an aging unit versus replacing it is the real question, the Navien tankless water heater cost guide has current unit pricing by series.
Navien's own FAQ sets the expectation directly: homeowners face only limited troubleshooting they can safely do, since the product involves water, electricity and gas, and Navien recommends contacting your original installer or a Navien Service Specialist. A documented reset exists for specific situations, but a code that returns after one points to a professional visit.
One documented example: Navien's guidance on a frozen unit describes clearing the stored fault by pressing the reset button once the unit has thawed. If the code returns, the freeze may have damaged a sensor, the control board or the flow switch, and a service visit replaces guesswork. The same guidance treats a gas smell or water dripping from the casing as reasons to shut off supply and call a professional.
Routine maintenance carries its own warranty risk: Navien warns that damaging the unit while servicing it yourself can void the warranty, and recommends a certified technician for the annual service that protects the heat exchanger's coverage term. For the specific codes your model displays, see the Navien tankless water heater repair guide.
Every figure on this page is listed here with its publisher and, where stated, its date. If a claim is not traceable to this list, it should not be treated as sourced.
Terms change. Check these dates against today before treating a figure as current.
No. A Licensed Professional, typically your installer or a listed Navien Service Specialist, inspects the unit first and reports the findings to Navien's Technical Support Team. Navien approves the repair and ships parts to that provider, usually within 1 business day, per Navien's Warranty Claim Process page.
Buying the unit online or through a distributor Navien has not authorized, having it installed by a non-licensed installer or against the installation manual, and skipping required maintenance, per Navien's NPE Warranty page. All three are checked before a claim is approved.
Navien's registration page does not state registration is required to keep the base warranty active, but registering certain water treatment products installed after October 10, 2024 adds one year to the labor warranty, per Navien's Product Registration page.
Contact Navien Customer Care, with the unit's serial number ready, a 15 to 16 digit number located between two barcodes on the right side of the unit, per Navien's Warranty Claim Process page.
Yes. Alongside its NPE, NHW and NPN tankless series, Navien sells the NWP500 heat pump water heater, which stores hot water in a tank and comes in three sizes, 50, 65 and 80 gallon, per Navien's residential water heaters page.
Navien's own FAQ says homeowner troubleshooting is limited because the product involves water, electricity and gas, and recommends contacting your installer or a Navien Service Specialist. A documented reset exists for specific situations, but a code that returns after a reset needs a professional visit, not a repeat reset.
Independent Research
Published ranges for tank and tankless replacement, the failures that justify a repair, and the ones that do not. Sourced, dated, and free to read.
