Navien Authorized Service
Licensed Plumbing & HVAC
Professionals Serving the Bay Area
Services We Provide
Troubleshooting & Repair
Error-code diagnostics, ignition and flame faults, sensor and PCB failures, combustion analysis, and heat exchanger repair across Navien combi, boiler, tankless, furnace, and heat-pump systems.
Descaling & Flushing
Annual descaling, heat exchanger flushing, inlet filter cleaning, scale prevention, and combustion inspection to restore efficiency on residential and hydronic Navien systems.
Navien Installation
Full Navien product line installation — tankless, combi, hydronic boilers, furnaces, and heat pumps — including venting, gas sizing, recirculation, zoning, controls, and code-compliant startup.
Warranty Assistance
Authorized Navien support: warranty claim assistance, manufacturer-required diagnostics, documentation, repair verification, and direct coordination with Navien technical support.
Common Navien Problems We Solve
Real symptoms we diagnose and resolve across Navien tankless, combi, and hydronic systems.
Recirculation Problems
Hot water delay, crossover issues, internal pump faults, and recirculation instability.
Pressure & Flow Problems
Low flow, pressure fluctuation, activation failures, and inconsistent hot water delivery.
Ignition & Flame Faults
Ignition lockouts, flame loss, combustion interruptions, and flame rod contamination.
Error Code Diagnostics
Navien error code troubleshooting, sensor verification, and operational fault isolation.
Scale Build-Up & Overheating
Restricted heat exchangers, overheating shutdowns, mineral buildup, and maintenance neglect.
Venting & Exhaust Problems
Improper venting, intake restrictions, condensate issues, and combustion airflow faults.
PCB & Electrical Faults
Control board failures, communication issues, sensor wiring, and electrical troubleshooting.
Boiler & Hydronic Circulation Issues
Air in hydronic loops, circulator faults, zoning issues, and unstable system pressure.
Troubleshooting & Repair
We diagnose and repair Navien combi, boiler, tankless, furnace, and heat-pump systems — including error-code diagnostics, ignition failures, flame loss, circulation faults, sensor failures, and PCB/control-board issues. Heat exchanger diagnostics and replacement are handled in-house using manufacturer service procedures.
ABC Service uses combustion analyzers, gas pressure testing, and precision diagnostic tools for accurate troubleshooting — not guess-based parts swapping. That means faster repairs, fewer return visits, and equipment that runs the way Navien engineered it to.
Descaling & Flushing
Annual descaling, heat exchanger flushing, and inlet filter cleaning protect Navien tankless, combi, and hydronic systems from scale buildup that restricts flow, lowers efficiency, and shortens equipment life. We use professional flushing equipment and cleaning solution designed for condensing systems.
Every service includes combustion inspection and a performance check so we can verify the system has been fully restored to factory flow and efficiency. Recommended on both residential and hydronic Navien systems every 1–2 years depending on water quality and usage.
Navien Installation
ABC Service installs the full Navien product line — not just tankless water heaters. That includes tankless and combi units, hydronic and condensing boilers, furnaces, heat pumps, and complete hydronic systems for residential and light commercial properties.
Every installation covers venting, gas line sizing, condensate routing, recirculation systems, zoning, controls, and startup and commissioning to Navien's published specifications — fully code-compliant and documented for warranty.
Warranty Assistance
Navien heat exchangers carry a 10-year manufacturer warranty, and replacement is one of the most common major warranty repairs as systems age. ABC Service performs full diagnostics — combustion analysis, flow verification, and leak detection — to confirm the failure before any warranty paperwork is initiated.
We communicate directly with Navien technical support, handle documentation and warranty verification, and order original OEM heat exchangers through Navien warranty channels. In many cases Navien ships warranty parts overnight, and our team installs and commissions the replacement quickly to minimize downtime.
The same authorized workflow applies to control boards, sensors, and other covered components — verified diagnostics, documented evaluation, and coordinated repair through the proper Navien service channel.
Systems We Service
Every modern Navien platform — and the older generations still running in Bay Area mechanical rooms.
NPE Series
Condensing tankless water heaters — NPE-A2 and NPE-S2 generations.
NCB Series
Combi boilers delivering space heating and domestic hot water in one unit.
NHB Series
Dedicated condensing hydronic boilers for radiant and panel heating.
NFB Series
High-mass fire-tube condensing boilers for larger residential and light commercial loads.
Combi Boiler Systems
Combi installations balancing DHW priority with radiant and panel heating demand.
Hydronic Boiler Systems
Full hydronic integration: zoning, primary/secondary piping, mixing valves, and controls.
Need Navien service or diagnostics?
We respond quickly with experienced troubleshooting, maintenance, repair, and hydronic system support throughout the Bay Area.
Why ABC Service
Electrical • HVAC • Plumbing Under One Contractor
Licensed C-10 Electrical, C-20 HVAC, and C-36 Plumbing — one team, one schedule, one point of accountability.
Licensed Bonded & Insured
Fully licensed contractor, bonded, and carrying general liability and workers' comp insurance.
Same-Day Service Availability
Urgent service and safety calls prioritized with same-day diagnosis when scheduling allows.
Residential & Commercial Experience
From kitchen remodels and panel upgrades to tenant improvements and commercial equipment hookups.
Flexible financing options available.
Flexible financing options may be available for qualified customers through GoGreen Financing — HVAC, heat pumps, boilers, water heaters, electrical upgrades, and EV chargers.