For NR/NP Series installed in residential applications (Domestic Hot Water Use Only): 15 Years on the Heat Exchanger, 5 years on all other parts and components, and 1 year on labor (manufacturer’s defect).
For NP Series installed in commercial use or residential space heating use: 10 Years on the Heat Exchanger, 3 years on all other parts and components, and 1 year on labor (manufacturer’s defects).
The issue is most likely the flow sensor inside the unit is not spinning properly.
We recommend opening and closing the pressure relief valve (should be located near the outlet of the unit). Depending on amount of debris affecting the flow sensor, this may help temporary. We recommend contacted your original installer or an NSS to service the sensor.
If you feel like there is an issue with your unit, please have someone contact Navien Technical Support while in front of the unit with your Serial Number ready. We recommend that a license contractor, original installer, or NSS contact is the person who calls us, so we may do in depth troubleshooting to determine if there is a part failure.
Navien Technical Support will be unable to send out parts without registration of product (Serial Number, Date of Installation, Homeowner Information, and Installer Information).
With Navien Condensing, you get the best of both worlds :
The Best Value and “Ultra Condensing Efficiency”, which offers substantial savings and contributes to a green-friendly environment.
Plus, the installation and venting processes are easy, cost effective,
and Navien’s products are simply the best in quality and performance.
Navien, Inc., is the leader in Condensing Tankless Technology and Combination Gas Boilers. Our products offer some of the highest efficiency ratings in the industry. Navien takes pride in providing “the ultimate in energy efficiency with high-tech comfort.