Thermador CIT304GM - Manual (Page 11)

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Do not heat up empty pans, or use pans with a thin base. The cooktop has an
internal safety system, but an empty pan could heat up so quickly the "automatic
deactivation" function does not have time to react and the pan could reach a very
high temperature. The pan base could melt and damage the cooktop glass. In the
event this occurs, do not touch the pan and turn off the element. If it does not
function after cooling off, contact technical service.
Each element has a minimum limit for detecting cookware, which varies based on
the material of the pan you are using. Therefore, you should use the element that
best matches the diameter of your pan.
Empty pans or pans
with a thin base
Cookware detection