Navien Authorized Service
Installation, diagnostics, repair, descaling, and support.
Tankless water heaters, combi units, and hydronic boiler systems for residential and light commercial properties.
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.
Navien service: frequently asked
Trusted Across the Bay Area
Homeowners and businesses across the Bay Area trust ABC Service for hydronic heating, HVAC, boilers, heat pumps, and electrical work.
Extremely clean boiler installation and excellent communication throughout. They engineered the system properly instead of just swapping a unit on the wall.
Fast response and genuinely knowledgeable about radiant heating. Heat pump retrofit and panel upgrade done in one project — permits and rebates included.
Professional team, clean work, and honest diagnostics. Upsized our service for the EV charger — on time, on budget, and inspected the same week.
Tankless install with recirculation done right. Coordinated cleanly with our GC and walked us through every decision. Easily the most professional trade we worked with.
Radiant floors throughout a remodel. They designed the manifold layout properly and the comfort is incredible. Quietest system we've ever had.
Furnace replacement plus new ductwork. Quiet, efficient, and the crew treated our house better than we would have. Inspection passed first try.
Honest diagnostics and skilled HVAC technicians. They took the time to walk through the system and explain every recommendation.
Engineered for the Bay Area
From the Peninsula to the South Bay, San Francisco, and the Santa Cruz coast — we design, install, and service premium mechanical and electrical systems across six counties. Our team supports high-efficiency boilers, hydronic heating, HVAC, heat pumps, and electrical upgrades for modern Bay Area homes and light commercial properties.
- Santa Clara County
- San Mateo County
- San Francisco County
- Santa Cruz County
- Contra Costa County
- Alameda County
* Additional service areas available upon request.
