Gas cooktop burner sparks but does not light, even though gas can be smelled.

Safety first: If you smell gas strongly, turn off all knobs, open windows, and close the gas supply valve. Do not create sparks or flames.

User steps (if smell is slight and localized):

• Remove the burner cap and head; clean thoroughly with warm soapy water and a soft brush.
• Ensure the small port near the igniter electrode is clear.
• Refit the burner parts correctly and try lighting again.

Technical steps (gas technician):

• Check gas pressure at the cooktop inlet.
• Verify correct injector size and type for the gas used.
• Bleed air from the line if the installation is new.