The over-heating limiter thermometer (-37) is a safety
measure that blocks the heater in the event of over-
heating in the steam generation tank. The initial factory
setting is as shown by the triangular mark (-A) on the
top portion, indicating a temperature of 200°C.
If the selected temperature value of the over-heating limiter
  changes during use, normal pressure is blocked from the
  heater. Set to "Maximum Pressure State" and try turning the
  temperature control dial (-B); if the heater turns on and off, set
  the temperature at about 10 °C higher.