"Backburner" on gas cooker

[TiggerToo]

After a couple of minutes from lighting a burner on my SMEV cooker, the burner starts to "roar" and the gas jet UNDER the burner cap lights - partially burning some of the gas.

What could this be caused by, and what can be done about it? I disassembled the cap, but there was no dirt visible....

 

[VicS]

Using the correct gas at the correct pressure according to the plate on the cooker ?


Is there any provision to adjust ( reduce) the air admitted to the burner ??

 

[TiggerToo]

The cooker was "checked out" and serviced by a gas installer just before this problem appeared....

 

[Cymrogwyllt]

finger trouble?

Is the burner seated correctly?