What actually goes wrong with a Navien NHB heat-only boiler in Delta 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 Delta 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.
Delta homeowners most often call us about a boiler that's stopped producing heat entirely, or one that's developed a persistent drip or pooling water near the base — the second is particularly common in Ladner's older crawlspace-access homes. A rattling or kettling sound at the heat exchanger and a lockout that returns after resetting round out the usual list.
We start with the fault history, then combustion analysis and a check of the condensate path. On Ladner properties with crawlspace mechanical access we also confirm the condensate line is actually draining rather than pooling, since the area's high water table makes that check more important than it would be on a full basement install elsewhere.
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.
Delta sits low on the Fraser River delta, and parts of the municipality, especially around Ladner, have a high water table that affects how crawlspaces and mechanical areas drain. Older character homes in Ladner often have their mechanical equipment in a crawlspace or a small utility area rather than a full basement, which changes access for both diagnosis and replacement. Flood construction requirements that apply in parts of Delta can also affect where new equipment is permitted to sit, which is something we check with the Corporation of Delta before finalizing a replacement plan.
Costs on a boiler repair depend almost entirely on which part failed and how accessible the unit is, so we do not quote a number sight-unseen over the phone.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.
Most repairs in Delta are ordinary wear-item swaps. The exception is condensate-related corrosion on older crawlspace installs where drainage has been marginal for years — once that's reached the heat exchanger, repair rarely makes sense and replacement is the honest recommendation.
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's more of a factor for where equipment can be located and how a crawlspace drains than for the boiler's operation directly, but it can affect condensate drainage routing on a replacement. We check site conditions as part of any install.
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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