Gas range shows Er04 and one burner will not ignite while others work

Safety first: Turn off the burner and allow it to cool. Disconnect power before removing parts.

Steps:

• Clean burner: Remove the burner cap and head. Clean all gas ports with a soft brush and a wooden toothpick. Do not enlarge the holes.
• Check alignment: Refit the burner head and cap, ensuring they sit flat and correctly over the electrode.
• Inspect electrode: Look for cracks in the ceramic insulator or heavy buildup. Clean gently and ensure the gap to the burner is correct (per SMEG spec, typically 3–5 mm).
• Check wiring: Under the cooktop, verify the electrode wire is firmly attached to both the electrode and ignition module.
• Replace electrode: If there is still no spark at that burner, replace the spark electrode.

Warning: After reassembly, check for gas leaks and proper flame before normal use.