Buzzing draws more calls about the NIT5660UC than any real failure. Bosch sells it in the 500 Series as a 36 inch induction cooktop with no connectivity, with 37 inch black ceramic glass. On a high setting, a lightweight multi-ply pan can hum audibly because the magnetic field makes its layers vibrate against one another.
That is the pan and not the cooktop: try a heavy pan made of one material on that zone and the sound goes away. Another harmless behavior is the residual heat indicator, which remains lit well after you finish cooking because the glass is still hot.
What does deserve attention in time is the cooling fan. When its bearing wears, the noise can grow irritating. A fan that keeps spinning after cooking has finished is usually just finishing its cooling cycle. At a visit we swap in different pans, then listen to the fan alone.
Normally no. Light multi-ply pans can vibrate in the magnetic field. Swap in a heavy pan made of one material. If the cooktop itself still hums, let us listen.
Yes, it can continue for a while to cool the electronics. A fan that runs for a very long time, or sounds rough, is worth having checked.
It is the residual heat warning: the glass is still hot. It can stay lit for a long time after cooking, so wait for it to go out before cleaning.
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