Gas hob with flame supervision shows E31 and gas supply to one or more burners is cut off shortly after ignition.

Safety first: Turn off gas and power before disassembly. Gas work should comply with local regulations; in many regions, only licensed gas technicians may service gas components.

• Clean and align: Ensure the burner cap is correctly seated. Clean the thermocouple tip and burner ports with a soft brush. The thermocouple tip should be directly in the flame when lit.
• Hold knob longer: Light the burner and hold the knob depressed for 10–15 seconds to allow the thermocouple to heat fully. If the flame still goes out, the thermocouple may be weak.
• Inspect connections: Access the underside of the hob and locate the thermocouple connection at the gas valve. Tighten the nut gently; do not overtighten.
• Replace thermocouple: If the problem persists on a single burner, replace that burner’s thermocouple / flame failure sensor.
• Valve replacement: If a new thermocouple does not resolve the issue, the gas safety valve for that burner may be defective and should be replaced by a qualified gas technician.