I have an issue with my gas hobs.
It's a double burner and sometimes both have the issue but mostly it is just one of them whilst the other is fine at the same time.
Instead of the flame coming from the little holes and creating little blue flames at each hole it burns a large yellow flame and also appears to burn from the (what I assume is as I don't know) the air holes underneath the actual top disc burning piece.
I have tried cleaning it and we have had new gas fitted also.
I have a video of it but I'm not sure how to attach it here!!??
Greetings & Welcome!
The best I have to offer is a link to some videos for you.
https://www.google.com/search?q=gas+hob+repair&safe=active&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjkl8GwwPbVAhUE0WMKHXpJDXMQ_AUIDSgE (https://www.google.com/search?q=gas+hob+repair&safe=active&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjkl8GwwPbVAhUE0WMKHXpJDXMQ_AUIDSgE)
Good Luck!