What actually goes wrong with a Navien NHB heat-only boiler in Langley homes, and how CANRO's licensed technicians diagnose and repair it.
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Quick answer
A Navien NHB that has lost heat, won't ignite, or is throwing a lockout in a Langley home usually points to a condensate blockage, an ignition or flame-sensing fault, or a circulator problem rather than the boiler being finished. A licensed technician can usually diagnose it on a single visit and tell you honestly whether it is worth repairing.
Need a licensed gas fitter for your gas boiler? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
Langley calls split fairly evenly between acreage properties on well water and newer subdivision homes closer to town. On the acreages, kettling at the heat exchanger and a boiler that's slower to heat than it used to be are the top complaints; in newer subdivisions it's more often a lockout that keeps returning after a reset.
We check the fault log first, then run combustion analysis and inspect the condensate trap and ignition components. On acreage properties with outbuildings tied into the same system we also trace the piping layout carefully, since additions over the years aren't always documented.
Because this is combustion equipment tied to your gas line, only a Technical Safety BC licensed gas fitter should be opening the burner or gas valve assembly — CANRO holds gas licence LGA0043870 and boiler licence LBP0046450.
Langley covers both the more urban City of Langley and the largely semi-rural Township of Langley, and a lot of Township properties, especially acreages and horse properties, run on well water rather than the municipal system. That harder water means more scale exposure for a boiler's heat exchanger over the years. Acreage properties also often have outbuildings with their own heating needs and longer runs of gas piping, and which municipality issues the permit — Township or City — depends on exactly where the address sits, so we confirm that early rather than assume.
Costs on a boiler repair depend almost entirely on which part failed and how accessible the unit is, so we do not quote a number sight-unseen over the phone.
| Item | 2026 ballpark |
|---|---|
| Diagnostic / service call | $90–$150 (credited toward the repair) |
| Boiler repair, typical | $250–$1,800, most jobs $400–$900 |
| Igniter or flame sensor | included in typical range above |
These are 2026 public-market ballparks, not a quote — CANRO's certified technicians confirm the actual cost after a short in-person assessment, since access, part availability, and how the unit was originally installed all move the number.
Wear items — igniters, sensors, circulators — make up most Langley repairs. Harder well water on Township properties means scale-related exchanger damage can show up sooner than on the municipal supply in the City of Langley core, which is the main thing that shifts the repair-versus-replace math here.
Safety note
If you ever smell gas, hear a hissing sound near the boiler, or notice soot, a burnt smell, or a yellow/flickering flame at the burner, shut the unit down if it is safe to do so, leave the house, and call FortisBC's emergency line at 1-800-663-9911 from outside before doing anything else. Gas and combustion work on a boiler must only be opened up by a Technical Safety BC licensed gas fitter.
We book based on the current schedule and how urgent the situation is — a home with no heat at all is prioritized, but we do not promise a specific arrival window until we've confirmed availability. Call the office and we'll give you an honest timeline.
One lockout can be a nuisance trip, but a boiler that keeps locking out after being reset has a real fault that needs diagnosing, not another reset. Repeated resets can mask a developing ignition or gas-valve problem.
It mostly affects which municipality issues the permit for a replacement, since Township and City of Langley are separate jurisdictions. We confirm the right authority before pulling any paperwork.
Navien's NHB line is a current production series, so common wear parts are generally obtainable, though lead times vary by part and supplier. We confirm availability as part of the diagnosis rather than guessing.
A straightforward like-for-like part replacement usually does not require a new permit, but any work that touches the gas line, venting, or the boiler's control setup can trigger one depending on scope. We handle that paperwork when it applies.
If it is holding a steady flame with no smell of gas and no repeated lockouts, it is usually fine to keep it running until the visit. If it is locking out repeatedly or you smell gas, shut it down and call FortisBC first.
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