Gas hob shows F2 and gas stops flowing to one or more burners shortly after ignition

Safety first: Turn off gas at the main shutoff. Work in a well-ventilated area and avoid open flames.

• Check flame contact: Ensure the burner flame properly envelops the thermocouple tip. Clean burner ports and reposition burner cap if needed.
• Hold knob longer: When lighting, press and hold the knob for 5–10 seconds to allow the thermocouple to heat and the safety valve to open fully.
• Inspect thermocouple: From below, check that the thermocouple is firmly connected to the gas valve. Tighten the nut gently if loose.
• Replace thermocouple: If the flame goes out as soon as you release the knob despite correct flame, replace the thermocouple for that burner.
• Valve replacement: If a new thermocouple does not solve the issue, the gas safety valve may be defective and should be replaced by a qualified gas technician.