The Burner flame goes out after you have let go of the control knob
Push the control knob down and turn it counterclockwise to the maximum position, don't try to ignite the burner on a minimum position.
After you have lit the flame, keep the knob pushed for equal or less than 10 seconds.
Check the burner cap and crown are positioned correctly and the burner crown is clean or if you just cleaned them make sure they a completely dry
If the above steps don't resolve the issue then a service visit by one of our approved service providers is recommended.
The burner cap or crown not placed correctly or blocked with debris/water
The thermocouple has failed