In a Tsawwassen home, a boiler that won't light almost always comes down to the ignition system rather than the boiler itself needing replacement.
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Quick answer
A gas boiler in Tsawwassen that fails to ignite, or lights briefly before shutting off, is most commonly caused by a fouled flame sensor, a worn igniter, a gas valve issue, or a safety switch blocking ignition due to low system pressure. Check the thermostat setting and the boiler's own service switch before calling. Diagnosing and repairing the flame sensor, igniter, or gas valve requires a licensed gas technician, since these are combustion-system components.
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.
Boiler controls are built to confirm an actual flame within a second or two of ignition using a flame sensor, and if that confirmation never arrives, the boiler cuts gas flow rather than keep attempting to light. This is intentional, not a fault in itself, and it means a boiler that seems to light for a moment and then goes out is very often just a flame sensor coated in combustion residue that can no longer reliably detect the flame, even when combustion is otherwise happening normally.
A large share of Tsawwassen's housing dates to the 1960s and 70s bungalow and split-level boom, and boilers on these older properties have often been in service for many years by the time an ignition fault appears. Components like the flame sensor and igniter degrade gradually with normal use, so an ignition problem on an older Tsawwassen boiler is frequently a worn part at the end of its practical service life rather than a sign of anything more serious with the unit as a whole.
A technician checks system pressure and any lockout indicators first, then inspects the flame sensor for fouling and tests the igniter and gas valve. Flame sensors often just need cleaning rather than outright replacement, since even a thin coating of combustion byproduct is enough to interfere with proper flame detection.
| Component | Typical installed cost |
|---|---|
| Igniter or flame sensor | $100–$400 |
| Gas valve | $200–$1,100 |
| General boiler repair, typical bill | $250–$1,800 (most $400–$900) |
As a ballpark, not a quote, these figures are confirmed by the CANRO office once a technician has diagnosed the actual fault. A $90 to $150 diagnostic or service call fee is generally credited toward the repair once you go ahead with it.
All ignition system, gas valve, and combustion component work must be carried out by a Technical Safety BC licensed gas fitter. CANRO holds provincial gas licence LGA0043870 and boiler licence LBP0046450. Given the gas and combustion safety involved, this isn't a repair to attempt as a homeowner.
Safety note
If you ever smell gas near the boiler or suspect a leak, leave the home immediately and call FortisBC's emergency line at 1-800-663-9911 from a safe distance before doing anything else. Ignition system and gas valve repairs must be completed by a Technical Safety BC licensed gas fitter.
This is typically a flame sensor coated in combustion residue that can't confirm the flame is present, so the boiler's safety control shuts gas flow back off even though ignition did briefly occur.
No. Reaching the flame sensor and igniter involves opening the combustion chamber near the gas valve, which must be done by a licensed gas technician, not attempted as a DIY repair.
Many boilers include a low water pressure safety switch that prevents ignition until pressure is restored, which protects the heat exchanger from operating without proper water flow.
As a ballpark, not a quote, an igniter or flame sensor typically runs $100 to $400, a gas valve $200 to $1,100, and a general repair bill usually falls between $250 and $1,800.
Yes, since ignition components wear gradually over years of normal use, and many Tsawwassen homes still run boilers original to their 1960s or 70s construction.
No, repeated resets can mask the underlying fault. Note any lockout indicator you see and call a technician rather than continuing to reset the unit yourself.
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