Gas cooktop burner flame is yellow and produces soot on pans.

Safety: Turn off the burner and allow it to cool before disassembly. If you suspect incorrect gas type or pressure, contact a gas technician.

• Clean burner thoroughly: Remove burner cap and head. Clean all ports and the underside air inlets with a brush. Ensure no food debris or foil is blocking air flow.
• Check flame spreader: Make sure the burner cap is not warped and sits evenly. Replace damaged caps.
• Verify gas conversion: If the appliance was converted from natural gas to LPG (or vice versa), confirm that the correct Ariston injector nozzles are installed for your gas type.
• Professional adjustment: If yellow flames persist, have a licensed gas fitter check gas pressure and adjust the air–gas mixture as per Ariston specifications.