Furnace Ignitor Replacement in Chilliwack

Need a licensed gas fitter for your gas furnace? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.

What the Igniter Actually Does

When the thermostat calls for heat, the furnace runs the draft inducer to prove airflow, then energizes the igniter for a few seconds before opening the gas valve. Older furnaces sometimes used a standing pilot instead, but most furnaces built in the last couple of decades use either a spark igniter or a hot surface igniter that glows hot enough to light the gas as it's released. Either way, this is the very first step in every single heating cycle — if it fails, nothing downstream happens.

How an Igniter Fails

Hot surface igniters are made from a brittle ceramic element that weakens with every heating cycle it goes through, similar to how an incandescent light bulb filament degrades over time. Eventually it either stops glowing hot enough to light the gas reliably, or it cracks outright. Spark igniters fail less predictably, often from a cracked electrode or carbon buildup interfering with the spark. Both types are considered normal wear items, not a sign anything else is wrong with the furnace.

Signs Your Igniter Is Failing

• The furnace's blower runs, but the burners never light
• You hear the draft inducer and a brief click, then nothing
• The furnace attempts to light several times before it either succeeds or locks out
• Ignition that used to be instant now seems to take noticeably longer
• The furnace has recently started needing more thermostat resets than usual

What a CANRO Technician Does

A technician confirms the igniter is actually the cause, rather than a flame sensor or gas valve issue producing a similar symptom, by testing it directly with proper equipment. If it's confirmed faulty, replacement involves shutting off power to the furnace, carefully removing the old igniter without touching its ceramic element with bare hands, since oils from skin can shorten a new one's life, installing the replacement, and testing a full ignition cycle before closing the furnace back up.

Repair vs. Replace

An igniter failure on its own is almost always a straightforward, affordable repair rather than a reason to consider replacing the whole furnace. The office can give a better sense of pricing once a technician confirms the part, and the repair is quoted before work begins. It's only worth thinking about full replacement if the igniter is failing alongside several other ageing components at once, in which case new furnace installation is ballparked at $4,500 to $9,500 or more.

Why This Comes Up Often After a Chilliwack Cold Snap

An igniter that's been slowly weakening for months often finally fails during the exact stretch it's asked to work hardest — a Fraser Valley cold snap with repeated outflow-wind days in a row. CANRO sees a real seasonal pattern in igniter replacement calls tied to those cold stretches, which is part of why an annual pre-season check is worth doing rather than waiting for a failure.

Spark vs. Hot Surface: Why the Type Matters for Diagnosis

A hot surface igniter can often be visually inspected once a technician has the panel open, since a hairline crack or an obviously dim glow is sometimes visible without any test equipment at all. A spark igniter's failure is less visually obvious, more often showing up as weak or inconsistent sparking that's better confirmed with a meter than by eye. Knowing which type a furnace uses, something a technician confirms almost immediately by the part's shape and how it's mounted, shapes exactly how the diagnostic step proceeds and how quickly a technician can move from suspicion to confirmed cause.

Either type is a standard stocked part for most common furnace brands, which is part of why this repair is usually completed same-visit rather than requiring a return trip. The bigger time factor tends to be access — an igniter tucked behind other components in a tightly packed furnace cabinet takes longer to reach safely than one mounted in an open, easily accessible burner compartment, even though the part itself and the installation steps are identical either way.

Why Igniters Shouldn't Be Swapped Preventively Without Reason

Some homeowners ask whether it's worth replacing the igniter proactively during a maintenance visit, before it actually fails, on the logic that it's a cheap part and avoiding a future no-heat call sounds appealing. In practice, a hot surface igniter that's tested and reads within normal resistance range is doing its job, and unnecessarily disturbing a working part — especially one as fragile as a ceramic igniter — carries its own small risk of accidental damage during removal and reinstallation. Most technicians recommend testing and monitoring the igniter during annual maintenance rather than replacing it purely on a preventive schedule.

Where preventive replacement does make more sense is on a furnace where the igniter has already needed replacing once, since a furnace that's gone through one igniter in a relatively short time can be more prone to going through another sooner than average, sometimes due to voltage fluctuations or a furnace that cycles unusually often for the size of the home. In that specific situation, a technician might reasonably suggest keeping a slightly closer eye on it rather than waiting for a repeat no-heat call.

One Visit, Not a Recurring Subscription

It's worth setting expectations clearly: a properly diagnosed and installed igniter replacement should resolve the ignition failure completely, not just temporarily. If a furnace needs a second igniter within a short stretch after the first was replaced, that's unusual enough to be worth raising directly with the technician, since it can point toward a separate contributing factor, like voltage irregularities on the circuit or a furnace that's cycling far more often than it should for reasons unrelated to the igniter itself.

Frequently asked questions