7OperationHob burner control knobsThe symbols on the knobs mean:z = no gas supply= maximum gas supply= minimum gas supplyFor easier lighting, proceed beforeputting a pan on the pan support.Lighting the burnersPush the relevant knob down andturn it anti-clockwise until it reachesthe "maximum" position.Only for mod. ZGF 646 CT / ZGF646 IT / ZGF 648 IR / ZGF 643 ITXCAfter lighting the flame, keep theknob pushed down for about 5seconds. This will allow the"thermocouple" (see figure - lett. D) to beheated and the safety device to beswitched off, otherwise the gas supplywould be interrupted.Then, check the flame is regular andadjust it as required.If you cannot light the flame even afterseveral attempts, check the "cap" and“crown” (see figure - lett. A, B) are in thecorrect position.When switching on the mains, afterinstallation or a power cut, it is quitenormal for the spark generator to beactivated automatically.In the absence of electricity, igni-tion can occur without theelectrical device; in this caseapproach the burner with a flame,push the relevant knob down andturn it anti-clockwise until itreaches the "maximum" position.)A - Burner capB - Burner crownC - Ignition candleD - Thermocouple