Brand Repair Page
Navien Combi Boiler Repair in NYC
AM Profs Inc diagnoses and repairs Navien wall-hung condensing combi-boilers and tankless water heaters across New York City apartments and light-commercial spaces. If a unit won't ignite, is showing an E003 or E110 code, or the flow sensor isn't recognizing demand, we start from the actual fault.
24/7 urgent repair is available for Navien combi-boilers, including weekends and holidays. A no-heat or no-hot-water call in cold weather is treated as urgent.
Covered Equipment
Wall-hung condensing combi-boilers
Tankless water heaters
Stainless steel heat exchangers
Flow sensor assemblies
Space-saving hydronic heat systems
Navien's compact wall-hung units are a common fit for NYC apartments where space for a traditional boiler and separate water heater isn't available.
Quick Answer
What is the most common Navien repair issue in NYC?
The most common Navien service calls involve the flow sensor accumulating debris or failing on older units — this prevents the unit from recognizing water flow and igniting at all. Ignition faults (logged as E003) and exhaust or flue-related overheating (logged as E110) are the next most common calls, both requiring the specific fault to be confirmed before parts are ordered.
Last updated: July 2026
Why Navien Repairs Need Brand-Specific Service
Navien is widely credited with a genuine industry first: introducing the first ultra-high-efficiency condensing gas tankless water heater with a stainless steel heat exchanger, a design that significantly improved corrosion resistance and lifespan compared to the copper exchangers used before it.
The company was founded in 1978 in South Korea as Kyungdong Boiler Co., Ltd., originally manufacturing oil boilers before expanding into gas condensing tankless water heaters. It operates in North America under the subsidiary Navien Inc., part of Kyungdong Navien Co., Ltd.
What Makes The Brand Different
Space-saving design means combined systems
Navien's wall-hung combi-boilers provide both space heating and domestic hot water from a single compact unit, which is exactly the kind of space-saving solution NYC apartments and small buildings often need in place of a separate boiler and water heater.
That combined design means a single fault — like a failing flow sensor — can affect both heat and hot water at once, which is different from a conventional setup where the two systems fail independently.
Navien Systems We Service
Common symptoms, likely causes, what we check first, and when to call for each system type.
Combi-Boiler (Heating & Hot Water)
Common symptoms: No heat and no hot water simultaneously, unit won't ignite, or an error code displays on the front panel.
Likely causes: Flow sensor failure or debris buildup, ignition component fault, or an exhaust/flue restriction.
What we check first: Flow sensor condition, ignition sequence, and exhaust/flue path.
What work is done: Flow sensor cleaning or replacement, ignition component service, and flue correction where restricted.
When to call: As soon as both heat and hot water are affected, or an error code is displayed.
Tankless Water Heater Mode
Common symptoms: Hot water fails to ignite on demand, or water temperature fluctuates during use.
Likely causes: Flow sensor fault preventing flow recognition, or a heat exchanger scaling issue.
What we check first: Flow sensor operation and heat exchanger condition.
What work is done: Flow sensor cleaning or replacement, and heat exchanger descaling where needed.
When to call: If hot water won't start reliably or temperature swings during normal use.
Navien Error Codes
Codes below are informational — a code alone doesn't confirm the fix, and resetting power without addressing the underlying fault often just delays the problem.
E003
Indicates an ignition failure — the unit is not successfully lighting during a call for heat or hot water.
E110
Indicates an exhaust overheat or flue issue, often tied to a restricted or improperly vented flue path.
Frequently Asked Questions
Why does my Navien unit have no heat and no hot water at the same time?
Because a single Navien combi-boiler provides both space heating and domestic hot water, a fault like a failed flow sensor can affect both at once — unlike a conventional setup with a separate boiler and water heater that fail independently.
What does a Navien E003 code mean?
It indicates an ignition failure — the unit isn't successfully lighting when it receives a call for heat or hot water. This needs a technician to check the ignition components rather than just resetting power.
What does a Navien E110 code mean?
It indicates an exhaust overheat or flue issue, often related to a restricted or improperly vented flue path.
Why would the flow sensor cause my Navien unit to stop working?
The flow sensor tells the unit that water is moving through it so it knows to ignite. If debris accumulates or the sensor fails, the unit can't recognize flow and simply won't fire up, even though water is actually running.
What areas of NYC do you cover for Navien repair?
We schedule Navien repair across Manhattan, Brooklyn, Queens, and the Bronx.