A pilot light that won't stay lit, or won't light at all, is one of the most common calls on older standing-pilot gas appliances still common across Port Coquitlam.
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Quick answer
A pilot assembly on a standing-pilot appliance includes the small burner that stays lit continuously, the thermocouple or thermopile that senses its heat to keep the main gas valve open, and the orifice that supplies gas to the flame. Soot clogging the orifice, a weakening thermocouple, or drafts in the mechanical room can all cause the pilot to go out repeatedly. Replacement of the full assembly is often more reliable than replacing individual parts on an older unit.
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| Symptom | Likely cause |
|---|---|
| Pilot won't stay lit, weak thermocouple reading | Thermocouple nearing end of life |
| Pilot flame small or yellow | Clogged orifice or gas pressure issue |
| Pilot lit, main burner won't fire | Weak thermocouple signal not satisfying the gas valve |
| Pilot blows out under drafty conditions | Mechanical room ventilation or nearby draft source |
A standing pilot system is mechanically simple compared to modern electronic ignition, which is part of why so many of these older units are still running in Port Coquitlam decades after installation, but that same simplicity means a single weak component, most often the thermocouple, can take the whole appliance offline.
Standing-pilot water heaters and boilers remain common in the city's older single-family stock near Oxford Heights, Birchland Manor, and the streets close to the historic Fraser Mills site, many original to homes built decades ago and never upgraded to electronic ignition.
Basements and crawl-space mechanical rooms in these older homes, especially those near the Coquitlam River floodplain, can be drafty around foundation vents or older doors, and that airflow is enough to blow out a marginal pilot flame on a cold, windy Lower Mainland evening — worth checking room ventilation alongside the pilot assembly itself.
Safety note
This component is part of a gas-fired, pressurized heating or hot water system, so work on it should be done by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. If you ever smell gas near the appliance, leave the home immediately and call FortisBC at 1-800-663-9911 before doing anything else.
Relighting a pilot following the appliance's printed instructions is generally fine for most homeowners, but if it keeps going out repeatedly, that points to an underlying fault that should be diagnosed by a licensed technician rather than relit indefinitely.
The thermocouple is one part within the pilot assembly, alongside the pilot burner and orifice. Sometimes just the thermocouple needs replacing, but on an older unit a technician may recommend the full assembly for reliability.
Drafts are more common in winter, whether from foundation vents, door gaps, or wind pressure changes, and a marginal pilot flame is more likely to be disturbed under those conditions than on a calm day.
That depends on the appliance's age and condition overall — a technician can discuss whether a full appliance replacement with electronic ignition makes more sense than continuing to service an aging standing-pilot unit.
Stop immediately, leave the home, and call FortisBC at 1-800-663-9911 from a safe location. Do not attempt to relight the pilot again until a licensed technician has inspected the system.
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