Siemens EH675TK11E Repair Instruction page 109

5.25.2 Repair due to utensils left to stand
First, we clean the glass with Fairy, glass scraper and the
BSH detergent for ceramic surfaces.
It is also very important to check whether the inductors are in perfect
working order.
Even if they perform correctly, check that the NTC resistors are in
perfect working order to avoid subsequent problems.
5.25.3 Shimmering metallic stains on the glass surface
Under certain thermal conditions the heat transfer compound of the
NTC resistors may react with the coating on the back of the glass
surface. This may cause stains on the back of the ceramic which are
visible from above.
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