Bosch Hot Plate - Manual (Page 26)

26
Induction heating technology is based on the vibration
resistance of certain metals when subjected to
highĆfrequency waves. In some circumstances, these
vibrations can cause a certain degree of noise, such
as the following:
This occurs when cooking at a high power. The cause
of this is the amount of energy which is transmitted
from the hob to the cookware. This noise disappears
or becomes quieter when the power is turned down.
This occurs when the cookware is empty. This noise
disappears when water or food is added to the
cookware.
This noise occurs when cookware is used which
consists of layers of different materials. The noise is
caused by vibrations in the joint faces between the
different layers. This noise is made by the cookware. It
may change depending on the amount and type of
food being cooked.
This noise occurs principally in cookware which
consists of layers of different materials when it is used
at the highest heat setting and on two hotplates next
to each other. This whistling disappears or becomes
quieter when the power is turned down.
The electronics require a controlled temperature in
order to function reliably. The hob is therefore fitted
with a fan which runs at various speeds according to
the temperature detected. The fan may also run on
once the hob has been switched off if the temperature
it detects is still too high.
The noises described are normal and part of the
induction technology and do not indicate a fault.
Normal operating
noises for the
appliance
Low humming like a
transformer
Quiet whistling
Crackling
HighĆpitched whistle
Fan noise