BORETTI CRG916 Notice D'utilisation page 39

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Clean the hob with a damp cloth, and then dry the surface thoroughly.
Do not use detergent which risks causing blue-tinted colour on the
glass surface.
When the hob is first switched on the displays of all the radiant elements
light up simultaneously displaying the symbols
displays will then switch off immediately without emitting any sound.
If one or more knobs is not in "0" position when the hob is first
switched on, the relative displays light up as normal, but the radiant
element will not work. On turning the knob, the relative display will
show the adjacent symbol, signalling the radiant element failed to
work. The element will only work properly again once the knob is
returned to "0" position and a new power value is set.
as shown in the figure; the
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