Gas burner ignites but goes out when the knob is released

Safety first: Turn off gas if you smell unburned gas. Work in a ventilated area.

• Clean thermocouple area: Ensure the flame ports near the thermocouple are clean so the flame contacts the sensor tip.
• Hold knob longer: After ignition, keep the knob pressed for 5–10 seconds to allow the thermocouple to heat fully.
• Check flame size: If the flame is very small, clean the burner and verify correct gas type and injector size.
• Replace thermocouple: If the flame still goes out, replace the thermocouple for that burner. If the problem persists, the gas valve may need replacement by a professional.