AEG COMPETENCE 840 E Operating Instructions Manual page 13

Only when the coordinated switch arranged in the control panel is
switched on can the second hob circuit-then be switched in with the
contact switch.
Both heating circuits are controlled and switched off by the switch in
the control panel.
B Frying zone
My heating system has a circular arrangement and is controlled by
the coordinated switch arranged in the control panel, whereas the
heating system for the frying zone is switched- in with the contact
switch.
Both heating circuits are switched off by the switch in the control
panel.
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