F51 error on gas cooktop; one burner does not spark while others do.

Safety first: Turn off power and gas before lifting the cooktop surface.

• Swap components: Swap the burner cap and head with a working burner to rule out a blocked burner head.
• Inspect electrode: Check the ceramic insulator for cracks and ensure the metal tip is close (2–4 mm) to the burner cap.
• Check wiring: Under the top, verify the igniter wire is firmly attached to the electrode and spark module. Look for cuts or burns.
• Clean area: Remove grease and moisture around the igniter that could cause a short to ground.
• Replace igniter: If the electrode is damaged or still does not spark after cleaning and wiring checks, replace the igniter for that burner.