Siemens EH675TK11E Repair Instruction page 81

5.10.3 Solution
 This is more commonly seen with inductors when the user is
not used to the shorter heating times compared to radiator
plates and insufficient attention is paid when using them. In
order to mitigate this problem, it has been thought to include in
the user manuals comments such as "If you use thinly
enamelled pots, you may cause damage to your hotplate. We
recommend that you pay particular attention during the cooking
process and do not overheat them".
 Such thinly enamelled pots, due to the type of material and
especially due to the thickness of the base, are very weak and
can overheat rapidly. This is ever more so when using high
levels of power, empty pots or with little oil. If they are left for
too long, in other words, when the pot is "abandoned", firstly the
pot covering deteriorates and secondly the base begins to
deform, above 250ºC. Deformation of the base then results in
the average temperature measured by the sensor under the
glass (NTC) being less than the actual temperature, the hob is
not regulated and the overheating process is accentuated.
When reaching some 500ºC, the enamelled base begins to
melt and degrade (forming bubbles) and may even crack or
break the glass.
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