Gas Cooktop Burner Won't Light

If a burner on your gas cooktop won't light no matter how many times you try relighting it manually, the most common cause is clogged burner ports restricting gas flow at that position. Moisture on the igniter, or a faulty spark module, can also be responsible for the same frustrating symptom. This can affect a single burner or, less commonly, the entire cooktop depending on which underlying cause is actually behind it. 

Common Causes 

• Clogged ports. Food debris, grease, and spilled liquid can clog the small ports around a burner head where gas actually exits during regular cooking and cleaning over many months of use. This can prevent enough gas from reaching the igniter even when the spark is firing normally and clicking as expected every time. This is the most common cause of a single burner not lighting on the whole cooktop. 
• Moisture on the igniter. Water from cooking spills, cleaning, or kitchen humidity can settle on the igniter and temporarily prevent it from sparking properly, which is one of the more common and easily fixed causes on this list, often resolving once things fully dry out on their own within an hour or two of normal room air. 
• Faulty spark module. Many built-in cooktops use a shared spark module that sends power to each burner's igniter throughout the entire unit and its internal wiring harness setup. If the module itself fails, it can affect a single burner's connection or, less commonly, several burners at once depending on how the internal wiring is set up on that particular model and brand. 

When to DIY vs. Call a Pro 

You can safely clean the affected burner's ports and igniter with a soft brush and dry off any visible moisture before trying again, which resolves a large share of ignition issues on its own without needing a technician visit at all in most cases. It's also worth checking that the burner cap is seated correctly and squarely, since a misaligned cap can throw off how gas and spark line up even when nothing underneath is actually broken or clogged. Diagnosing a faulty spark module or the wiring feeding it is a job for a technician. 

FAQ 

Why does only one burner fail to light while every other one on the cooktop works perfectly fine? 

This usually points to something local to that burner, like clogged ports or moisture on its specific igniter, rather than a shared cause, since gas cooktops typically wire each burner's ignition somewhat independently of the others on the unit. 

What if every single burner fails to light at exactly the same time on the whole unit? 

This is a less common pattern and points more toward a gas supply issue, like a partially closed shutoff valve, or a failure at the shared spark module itself, rather than something localized to just one burner alone on the cooktop surface. 

Can I clean the ports myself safely without any special tools on hand at home? 

Yes, a soft brush or a needle designed for cleaning gas burner ports works well, and it's a completely safe DIY step as long as the cooktop is turned off and fully cooled down first before you start. 

Is a built-in gas cooktop's ignition system really any different from a range's at all? 

The core components, igniter, spark module, and burner ports, work the same way whether the gas burners are part of a range or a standalone built-in cooktop, so diagnosis follows the same general process either way for a technician on the visit. 

Is this an expensive repair to have a technician come out for this issue? 

Cleaning resolves most cases at no cost at all, and even a spark module replacement is generally a moderate repair rather than an expensive one compared to replacing the whole cooktop entirely, which is a much bigger job overall. 

If cleaning the burner doesn't help resolve the issue, Boreal can check the spark module and gas connections thoroughly, backed by a 90-day warranty on parts and labour for every job we complete, using genuine OEM parts throughout the repair from start to finish.