Zelmer is Polish brand with long tradition, although these days its production is probably in China like for everyone else.
Most tricky part of disassembling for me was screw hidden under hard to remove (thigh latches) "extra steam"/sprinkler buttons.
And this is what failed - thermal fuse MICROTEMP G4A00 240C, 10amps, 4mm diameter. Connected to wires with crimps, put in silicone tube and held by metal plate at heating element.
I'm assuming that bimetal thermal regulator is working fine and thermal fuse just tripped prematurely. Its characteristics says that it must trip at 240C, it must hold (holding temperature or Th) at 200C but it is also susceptible to aging so over time it might fail at lower temperature.
I've bought replacement (5pcs described as NEC Microtemp SF240E) on ebay for 1.49USD including shipping and reused original crimps.
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