Gas cooking appliance with error-proofing regarding the positioning of the burner head

Gas cooking appliance equipped with a top plate having at least one region for the attachment of an injector of a gas burner and for supporting a head of the said burner coaxial with the said injector and above the said plate with primary air being drawn in from on top of the plate,

• wherein said region of the top plate has a closed non-circular contour and in that the burner head has legs by which it rests on the aforementioned region of the top plate, the number and arrangement of which legs are such that they collaborate with the sides of the said non-circular contour of the said region so that the burner head can occupy only a determined and limited number of angular positions while at the same time being arranged coaxial with the injector and so that, for any incorrect positioning—in terms of orientation and/or in terms of centring—of the head, the latter rests on the top plate such that it is inclined and that the incorrectness is thus visible.