A Noritz tankless unit that won't hold a flame is usually an ignition, sensor, or venting issue rather than a simple pilot problem.
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Quick answer
Most gas Noritz tankless water heaters do not use a continuous standing pilot; they use electronic direct ignition that sparks a burner on demand. When homeowners describe a "pilot light" that keeps going out, the underlying cause is almost always a flame-sensing fault, a venting or air-supply restriction, or a fouled ignition component, not a literal pilot flame. A homeowner can safely check the vent termination and power supply; ignition, gas valve, and heat exchanger diagnosis needs a licensed gas fitter.
Need a licensed gas fitter for your tankless water heater? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
Older gas water heaters kept a small standing pilot burning around the clock, and homeowners naturally carried that language forward. Most Noritz tankless models sold in the last couple of decades instead use electronic direct ignition or intermittent direct ignition: a spark igniter fires only when a hot water tap opens and the flow sensor detects demand. There is no continuous flame to "go out" in the traditional sense, but the unit can still fail to ignite, lose flame partway through a draw, or shut down mid-shower, and homeowners describe all of these as the pilot going out.
Understanding this distinction matters because it changes where the fault usually lives. Instead of a worn thermocouple, the more common Noritz culprits are a flame rod that is not sensing properly, a blocked or iced vent terminal, insufficient combustion air, low incoming gas pressure, or a fan or igniter component reaching the end of its service life. Some Noritz control boards will display a fault code when this happens; the brief here won't guess at specific code numbers since they vary by model year, but a technician can read the board and interpret it against the manual for your specific unit.
None of this involves opening the unit's cabinet or touching the burner, igniter, or gas valve. Those are gas-safety components and are outside the scope of homeowner maintenance.
Coastal damp and salt-laden air along the Fraser River and around the Burrard Inlet can accelerate corrosion on flame rods and igniter electrodes over time, especially on units installed close to the exterior wall vent. In older character homes in Vancouver and New Westminster, narrow mechanical closets sometimes restrict combustion air more than the original installer anticipated, which can produce intermittent ignition trouble that only shows up during heavy simultaneous use, such as a dishwasher and shower running together.
Cold-snap conditions are another regular contributor. When outdoor temperatures drop sharply, a vent terminal on an exterior wall can develop light frosting that partially restricts exhaust and intake airflow, which some Noritz units interpret as an unsafe condition and respond to by locking out ignition until cleared.
| Step | Purpose |
|---|---|
| Read the control board's fault history against the specific model's manual | Narrows the fault to ignition, flame sense, venting, or flow before opening anything |
| Inspect vent terminal and intake for blockage, frost, or improper clearance | Rules out the most common environmental cause in this climate |
| Test flame rod signal and igniter spark quality | Confirms whether the sensing or ignition hardware is degrading |
| Check incoming gas pressure under load | Identifies undersized supply or a regulator issue feeding the unit |
| Review combustion air adequacy in the installation space | Flags a mechanical closet or enclosure that is too tight for the appliance |
A flame rod, igniter, or fan replacement is a routine repair on a Noritz unit that is otherwise in good working order, and it is worth doing on a unit within its expected service life. If the heat exchanger itself is showing corrosion or repeated control board faults on an older unit, and the appliance is well past a decade of hard residential use, replacement often makes more financial sense than chasing intermittent faults on aging electronics. A licensed technician can walk through that judgment call with you after an inspection rather than guessing from symptoms alone.
Tankless installs in this region typically run in the ballpark of $3,500 to $7,500 depending on venting complexity, gas line sizing, and access; that is a ballpark, not a quote, and any real number comes after a short in-home assessment.
Safety note
If you smell gas, notice soot around the unit's vent termination, hear a rattling or banging you have not heard before combined with a burning smell, or your carbon monoxide alarm sounds, leave the home immediately and call FortisBC at 1-800-663-9911 from outside before doing anything else. Gas connections, the burner assembly, the heat exchanger, ignition components, and venting on a tankless water heater must only be serviced by a Technical Safety BC licensed gas fitter. CANRO holds gas licence LGA0043870.
Most modern Noritz tankless models use electronic direct ignition rather than a continuous standing pilot, so what feels like the pilot going out is usually a flame-sensing or ignition fault instead.
A vent terminal that develops light frost or ice during a cold snap can restrict intake or exhaust airflow enough that the unit's safety controls block ignition until it clears.
Clearing obvious debris like leaves or a bird's nest away from the exterior vent cap is fine, but ice buildup, bent venting, or anything inside the unit should be left to a licensed technician.
Warranty terms are set by the manufacturer and vary by component and installation date, so check your registration certificate or ask your technician to confirm current coverage.
If other gas appliances in the home are also acting up, such as a furnace or range struggling to stay lit, that points toward a house-wide supply or pressure issue rather than a fault isolated to the water heater.
If the unit is well past a decade of use and showing repeated control faults or heat exchanger corrosion, replacement is often more sensible than continuing to chase intermittent ignition problems.
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