What actually goes wrong with a Navien NHB heat-only boiler in Coquitlam 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 Coquitlam 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.
Coquitlam callers often describe a boiler that's started short-cycling — firing, running briefly, and shutting off again — or one that's thrown a lockout that keeps coming back after a reset. On hillside properties we also hear about a unit that seems to struggle more on windy days, which can point to a venting issue rather than the boiler itself.
Diagnosis starts with the fault log, then combustion analysis and a check of the condensate trap and ignition components. On Westwood Plateau and Burke Mountain homes with longer vent runs we pay particular attention to the termination outside, since wind exposure at elevation can aggravate a marginal venting setup into a real fault.
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.
Coquitlam has a lot of elevation change packed into one city — hillside neighbourhoods like Westwood Plateau and Burke Mountain sit well above the lower, older areas around Maillardville and Austin Heights. Newer hillside homes sometimes have longer vent runs because of setback and clearance requirements, while older homes near Maillardville often have smaller, tighter mechanical rooms that take more care to work in. The city's growth over the last couple of decades also means we see a wide range of install ages and venting styles even on the same street, so we never assume a Coquitlam boiler was set up the same way as the one next door.
Costs on a boiler repair depend almost entirely on which part failed and how accessible the unit is, so we do not quote a number sight-unseen over the phone.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.
Repairs on Coquitlam NHB units are usually straightforward — sensors, circulators, and ignition components wear out regardless of where in the city the home sits. The exchanger cracking or corroding is the real dividing line, and once we're there, a full replacement is almost always the better value than chasing another repair.
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.
Newer hillside homes in areas like Westwood Plateau sometimes need longer vent runs to meet clearance requirements, which we check when diagnosing venting-related faults or planning a replacement. It doesn't change how the boiler itself operates.
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.
Family-run, TSBC-licensed (gas LGA0043870 · boiler LBP0046450), serving Metro Vancouver homes since 1999. Residential, natural gas only.
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