A dirty or failed flame sensor is the single most common reason a furnace ignites, runs for a few seconds, then shuts off. HeatLand cleans or replaces it the same day across Greater Vancouver.
What the flame sensor does
The flame sensor is a thin metal rod that sits in the burner flame and confirms to the control board that a flame is actually present. If it is coated in residue or has failed, the board assumes there is no flame and shuts the gas off for safety — producing the classic light-then-die cycle.
Signs your flame sensor has failed
- The furnace ignites, runs a few seconds, then shuts off
- Repeated ignition attempts that all fail the same way
- Heat that returns briefly after a reset, then quits again
- A lockout code pointing to flame failure
- Short-cycling that started gradually over a season
Same-day flame sensor replacement in Greater Vancouver
Often the sensor only needs careful cleaning, which restores normal operation — we will tell you if that is all it needs rather than selling a part. If the sensor has actually failed, we fit the correct replacement, then watch a full ignition cycle to confirm the flame is proven and held.
When to stop and call a technician
Gas furnace internals carry line voltage and, in some cases, live gas. If the furnace is locking out, smells off, or keeps failing after a reset, leave it off and book a licensed technician rather than forcing repeat restarts.
What to expect when you book
We start with a few questions to understand the symptom and find a visit time that suits you. On site, a licensed technician confirms the real cause, shows you the failed part, and gives a clear itemised quote before any work starts. We carry common furnace parts on the van, so most replacements are completed the same visit once you approve.
Talk to a licensed local HVAC team in Greater Vancouver.
Straight answers, fair pricing, and no pressure to buy what you don’t need.
Why homeowners call HeatLand
HeatLand is a local heating and cooling company based in Burnaby, serving Greater Vancouver and the wider Lower Mainland. We diagnose before we quote, we explain what we find in plain language, and we tell you honestly when a repair makes more sense than a replacement — or the other way around. There is no commission-driven upsell here.
Frequently asked questions
Does a flame sensor usually need replacing or just cleaning?
More often it just needs cleaning. A thin oxide or residue coating stops it reading the flame. We clean it first and only replace it if it has genuinely failed — the honest, cheaper path.
Why does my furnace light then shut off after a few seconds?
That is the textbook symptom of a flame sensor that can’t confirm the flame. The board cuts the gas for safety. Cleaning or replacing the sensor almost always resolves it.
Can you fix it the same day?
Yes. Cleaning takes minutes, and we carry common flame sensors on the van for the cases where a replacement is needed, so most calls finish the same visit.
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