# Furnace Ignition Repair Toronto | HSI and Flame Sensor

URL: https://bestfurnacerepairtoronto.ca/furnace-ignition-repair-toronto/

![Technician holding a hot surface ignitor beside an open furnace burner compartment](/images/misc/technician-holding-a-silicon-nitride-hot-surface-i.webp)

TSSA-Licensed Gas Technicians Since 2005

# Furnace Ignition Repair Toronto: Hot Surface Ignitor, Pilot and Flame Sensor Faults Cleared

Last updated: September 16, 2026

Hot surface ignitor, pilot, and flame sensor repair with TSSA compliance, $300 to $650 CAD.

Call Now: (416) 555-0100

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$300 to $650 CAD repaired

## Why Toronto Homeowners Call Us

-   TSSA G1 and G2 licensed technicians
-   20+ years of GTA furnace service
-   Diagnostic waived on same-visit repair
-   Written repair-vs-replace recommendation

**20+ Years** GTA Furnace Experience

**5-Star** Customer Satisfaction

**4-Hour** Emergency Response

**TSSA Licensed** G1 and G2 Certified

## What Is Furnace Ignition Repair in Toronto?

Have you ever woken up to a freezing home in the middle of January?

We know exactly how stressful that situation can be. Finding fast furnace ignition repair in Toronto becomes your only priority.

Toronto winters are completely unforgiving, with recent seasonal temperatures hovering around -5 to -10 degrees Celsius. The massive 160 cm snowfall in the 2025/2026 winter pushed local heating systems to their absolute limits.

> “A well-maintained furnace ignition system is the only thing standing between you and a freezing Toronto winter.”

Furnace ignition failure is the single most common reason a furnace fails to start on a cold morning. We diagnose and repair the specific components that light and confirm the burner flame on your gas furnace.

These parts include the hot surface ignitor, direct spark ignitor, standing pilot assembly, flame sensor rod, thermocouple, and the ignition control module. Our TSSA G1 or G2 licensed technicians handle every step carefully under the Ontario B149.1 fuel code.

Hot surface ignitor replacement runs $300 to $650 CAD, flame sensor work runs $150 to $450 CAD, and pilot and thermocouple work runs $250 to $550 CAD. We charge an initial diagnostic of $99 to $149 CAD, and that fee is completely waived on a same-visit repair.

![Flame sensor rod being cleaned and tested during an ignition repair](/images/maps/flame-sensor-rod-removed-and-being-cleaned-with-an.webp)

## The 3 Ignition Types and How Each One Fails

### Hot Surface Ignition (HSI)

Most modern furnaces use a hot surface ignitor made of silicon nitride or carborundum. We frequently replace these elements because they glow red hot to light the burners and naturally degrade over time. Failure usually appears as a tiny crack from constant thermal stress.

Our technicians confirm a failed HSI by looking for an out-of-range resistance reading in ohms using a multimeter. Typical service life for this part is 4 to 7 years. You should never touch a new carborundum ignitor with bare hands. The natural oils from your skin create hot spots on the element, which will cause it to burn out and fail almost immediately.

### Direct Spark Ignition

Direct spark setups use a high-voltage electrode that arcs to light the burner directly. We see failures here coming from electrode erosion, cracked ceramic insulators, or an incorrect spark gap. The gap between the sparking tip and the ground is usually around 1/8 inch, and even a tiny misalignment prevents ignition.

Our diagnostics also test the spark generator on the main control board. A faulty board will fail to send the necessary voltage to the electrode.

### Standing Pilot

Standing pilots are an older arrangement where a small flame burns continuously. We rarely see these on brand-new units, but many older Toronto homes still rely on them. A thermocouple sits directly in the flame and generates a tiny electrical current measured in millivolts.

Our rule of thumb is that a healthy thermocouple should generate about 30 millivolts. The gas valve will close safely if that output drops below 15 millivolts due to a drafty pilot, a misaligned orifice, or a worn-out thermocouple. A dirty pilot orifice completely blocks the gas flow, which starves the tiny holding flame.

## 5 Ignition Symptoms and What They Usually Mean

Here are the five most common warning signs and the typical underlying causes.

1.  **Clicks or glows, never lights.** The ignitor might be out of specification. We often find that the gas valve is not opening, or a pressure switch is failing to close upstream.
2.  **Lights then shuts down within seconds.** This indicates a flame rectification failure. Our most frequent fix for this is cleaning a dirty flame sensor rod, though it can sometimes be a grounding fault. Pro tip: Never clean a flame sensor with coarse sandpaper. Sandpaper leaves behind silica grit in the metal grooves, which acts as a heat insulator and ruins the rod. We recommend using 0000 steel wool or a soft Scotch-Brite pad instead.
3.  **Three attempts then stops entirely.** Your furnace has gone into a hard ignition lockout. The control board has done its job to protect the system. We advise calling for service, as a lockout often points to a serious ventilation block or a failing gas valve. Repeatedly cutting the power to reset the board is the wrong response and can be dangerous.
4.  **A bang on ignition.** This loud noise means you have delayed ignition, where gas accumulates in the chamber before finally lighting. Our technicians take this very seriously because the miniature explosion puts massive pressure on the delicate heat exchanger. You need to get this checked promptly to prevent carbon monoxide risks.
5.  **Pilot will not stay lit.** The thermocouple output has likely dropped below what the gas valve needs to stay open. We also check if the pilot flame is cleanly enveloping the thermocouple tip correctly.

## How Much Does Ignition Repair Cost in Toronto?

Pricing should be completely transparent, especially during high-demand months. We provide clear estimates so you know exactly what to expect before any tools come out. Our standard fees keep things simple and predictable.

| Work | CAD range |
| --- | --- |
| Diagnostic (waived on same-visit repair) | $99 to $149 |
| Flame sensor cleaning or replacement | $150 to $450 |
| Hot surface ignitor replacement | $300 to $650 |
| Pilot assembly and thermocouple | $250 to $550 |
| Ignition control module | $300 to $650 |

Ignition parts are inexpensive relative to the rest of the furnace. We prioritize an accurate diagnosis over a fast one for exactly this reason. Replacing an ignitor when the actual fault is a dirty flame sensor leaves you with the exact same no-heat call a week later. Our goal is to fix the right component the first time, saving you from paying a premium after-hours rate on a repeat visit.

## When an Ignition Fault Points at Something Else

A repeat ignition failure inside twelve months is a clear warning signal, not just bad luck. We always dig deeper when a new part fails prematurely. The Technical Standards and Safety Authority (TSSA) notes that poor maintenance is a major contributing factor to fuel-related risks in Ontario homes.

Our technicians look for several specific underlying issues before fitting a second replacement part:

-   **Excessive short cycling** that thermally hammers the ignitor.
-   **Incorrect manifold pressure** on the gas valve.
-   **A failing relay** on the main control board.
-   **A flame sensing problem** that traps the board in a permanent retry loop.

We test the gas valve output using a digital manometer, confirming the standard 3.5 inches of water column for natural gas. This extra effort prevents you from paying an annual ignitor bill on a furnace that actually has a completely different problem.

For the wider diagnostic across the gas train and controls, see 

gas furnace repair

[/gas-furnace-repair-toronto/ →](/gas-furnace-repair-toronto/)

.

Our emergency dispatch team is ready if your furnace is off right now in freezing weather, so just review 

emergency furnace repair

[/emergency-furnace-repair-toronto/ →](/emergency-furnace-repair-toronto/)

. Getting reliable furnace ignition repair in Toronto shouldn’t be a hassle.

The full set of published CAD scope bands is always available on the 

furnace repair Toronto

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 homepage.

Published CAD Pricing

## How Much Does Ignition Repair Cost in Toronto?

These ranges are published, not quoted on request. Every invoice itemises the diagnostic fee, parts, labour, and disposal separately.

| Scope of Work | Cost (CAD) |
| --- | --- |
| Standard Diagnostic Service Call | $99 to $149 |
| Flame Sensor Cleaning or Replacement | $150 to $450 |
| Hot Surface Ignitor Replacement | $300 to $650 |
| Pilot Assembly and Thermocouple Replacement | $250 to $550 |
| Ignition Control Module Replacement | $300 to $650 |

Ignition repairs run $300 to $650 CAD. Flame sensor cleaning or replacement alone sits at the lower end, from $150 CAD, and is often all that is needed.

Why Us for This Job

## Why Choose Best Furnace Repair Toronto for Ignition Repair

### 20+ Years of Furnace Repair Experience

Ignition faults are the most common no-start cause in the GTA, and two decades of them is what makes the diagnosis fast.

### Measured, Not Guessed

Ignitor resistance in ohms and flame rectification in microamps. Both are measured before a part is recommended.

### Ignition Type Identified First

Hot surface, direct spark, or standing pilot. Each fails differently and each has a different repair path and cost.

### TSSA G1 and G2 Licensed

Ignition work sits directly on the gas train. Licensed technicians, Ontario B149 fuel code, certificate numbers on the invoice.

### Lockout Behaviour Verified

After the repair we confirm the board's lockout and retry sequence works as designed, which is what stops a repeat call.

### Parts on the Van

Common ignitors, flame sensors, and thermocouples are carried, so most ignition faults finish on the first visit.

From Call to Verified Repair

## How Our Toronto Furnace Diagnostic Process Works, 5 Steps

01

### Symptom Intake

Does the furnace attempt ignition, light and drop out, or do nothing at all? Any lockout codes flashing on the control board.

02

### Ignition Diagnosis

Ignition type identified, ignitor resistance measured, flame rectification current read in microamps, gas valve and pressure switch operation verified.

03

### Written Quote

The failed component, the CAD cost, and whether the underlying cause is the component itself or something upstream.

04

### Repair

Component replaced or cleaned, burner compartment inspected, and the flame pattern observed across the burner row.

05

### Verification

Full ignition sequence run several times, lockout and retry behaviour confirmed, combustion analysis and CO reading recorded.

## Need Ignition Repair in Toronto or the GTA?

Same-day dispatch, TSSA-licensed technicians, and the diagnostic fee waived when you authorise the repair on the same visit.

(416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

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The Honest Conversation

## What Actually Stops Toronto Homeowners From Calling a Furnace Technician

The four hesitations we hear most often before a ignition repair booking, answered plainly.

“The diagnostic fee feels like a trap.”

Our diagnostic starts at $99 CAD and is waived when you authorise the repair on the same visit. It covers a full combustion analysis, a CO check, and a written fault report you keep either way.

“You cannot tell if the technician is really licensed.”

Ontario requires TSSA G1 or G2 certification for gas furnace work. Ours hold both, and certificate numbers appear on every invoice per B149 fuel code so you can verify them on the TSSA public registry.

“Nobody will publish the price.”

Every CAD range for this service is published on this page, above. Scope named, itemised into diagnostic, parts, labour, and disposal, with no quote form in the way.

“How do I know the work will not fail again next month?”

Combustion analysis is re-run and the CO reading verified before we leave, and the parts and labour warranty is issued in writing, typically 1 to 5 years depending on the part and manufacturer.

Our Work

## Ignition Repair Jobs Across the GTA

Click any image to view it larger.

 

Customer Feedback

## What Customers Say About Our Ignition Repair

> “Furnace ignition repair on a unit that kept locking out overnight. Cracked hot surface ignitor, replaced, and they ran four full ignition cycles before leaving to prove it held.”

A Anders L. Etobicoke (Mimico)

> “Flame sensor cleaning fixed what two other people had called a control board failure. They showed me the microamp reading before and after.”

R Rhea D. Thornhill (Uplands)

> “Old furnace with a standing pilot that would not stay lit. Thermocouple replaced, pilot adjusted, and honest advice that the unit still had a few seasons left.”

K Kenji M. Toronto (The Beaches)

Straight Answers

## Ignition Repair Questions, Answered

### How much does furnace ignition repair cost in Toronto?

Hot surface ignitor replacement runs $300 to $650 CAD and pilot assembly or thermocouple work runs $250 to $550 CAD. Flame sensor cleaning or replacement, which is often the entire fix, runs $150 to $450 CAD. The $99 to $149 CAD diagnostic is waived on same-visit repair.

### Why does my furnace try to start and then shut down?

The most common cause is the flame lighting but not being sensed, so the control board closes the gas valve within seconds as a safety response. That is a flame sensor or flame rectification problem, measured in microamps rather than diagnosed by eye.

### What is a hot surface ignitor and how long does it last?

A hot surface ignitor is a ceramic element, usually silicon nitride or carborundum, that glows red hot to light the burners. They typically last 4 to 7 years depending on cycling, and they fail from thermal stress and cracking rather than wear.

### Can I clean the flame sensor myself?

Physically it is a simple job, but the furnace has to be powered down and the rod removed and refitted correctly, and the result should be verified with a microamp reading. If cleaning does not hold for more than a few weeks, the underlying issue is usually rectification or grounding, not dirt.

### What does hard ignition lockout mean?

After a set number of failed ignition attempts, usually three, the control board stops trying and locks out. It is a safety feature that prevents repeated gas release into the combustion chamber. Repeatedly resetting power to clear it is the wrong response.

### My furnace has a standing pilot. Is it worth repairing?

Often yes if the rest of the unit is sound. Pilot assembly and thermocouple work runs $250 to $550 CAD. That said, a standing pilot usually means an older unit, so we will also give you the honest repair-vs-replace numbers on the furnace as a whole.

### How long does an ignition repair take?

Most ignition repairs complete in 60 to 90 minutes, including diagnosis, part replacement, several full ignition cycles, and a combustion analysis.

### Why did my ignitor fail again after a year?

A repeat ignitor failure points at something upstream: excessive short cycling, incorrect manifold pressure, a control board issue, or a flame sensing problem causing constant retry cycles. The part is a symptom in that case, and the diagnostic looks for the cause.

### Is a cracked ignitor dangerous?

The failure mode itself is a no-heat condition rather than a safety hazard, because the board will not open the gas valve without ignition confirmation. The hazard comes from repeatedly resetting a furnace that keeps failing, which is why lockout exists.

### Do you carry ignitors for my furnace brand?

Common silicon nitride and carborundum ignitors covering most Lennox, Carrier, Trane, Goodman, Napoleon, York, Rheem, and Bryant units ride on the van, along with flame sensors and thermocouples. That is why most ignition calls finish on the first visit.

### Still have a question about your furnace?

Tell us the symptom, the furnace age, and your postal code. We will tell you what it likely is and what the CAD range looks like before anyone is dispatched.

Call Now: (416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

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![](/images/misc/two-furnace-technicians-in-branded-winter-uniforms.webp)

Same-Day Emergency Dispatch, 24/7 Cold Snap Response

## Book Ignition Repair With a TSSA-Licensed Technician

Give us the symptom, the furnace age, and your postal code. You get the fault in writing and the CAD cost before any work on your ignition repair begins.

Call Now: (416) 555-0100

[tel:+14165550100 →](tel:+14165550100)

 

Send a Message

[/contact/ →](/contact/)

-   Diagnostic waived on same-visit repair
-   TSSA G1 and G2 licensed technicians
-   Published CAD pricing, no quote gating