Gas cooktop burner will not ignite but can be lit with a match.

Safety first: Turn off the burner knob and ensure there is no standing gas before working near the burner.

• Clean burner parts: Remove the burner cap and head. Clean all ports with a soft brush and warm soapy water. Ensure the small ignition port near the electrode is clear.
• Clean igniter: Gently scrub the ceramic igniter and metal tip with a toothbrush and mild cleaner. Do not use abrasive pads.
• Reassemble correctly: Place the burner head and cap back so they sit flat and centered. Misalignment can prevent gas from reaching the spark.
• Test ignition: Turn the knob to ignite and observe the spark. If there is no spark at that burner but others work, inspect the igniter wire and replace the electrode if cracked.