Bosch Sensixx B35L Repair Instructions page 19

5.2.3 Steam generation
Solenoid valve
The power of resistance and therefore the generation of steam are
controlled by the NTC2 and the pressure switch (model dependent).
The NTC2 feeds the resistance when the measured temperature is
145ºC or below; when the temperature is higher than 145ºC the
resistance power is cut off.
The indication of "steam ready" is also controlled by the NTC2 sensor
and lights up when it reaches 120ºC.
The pressure switch has a security feature, so it cuts the power of
resistance when 4 bar are reached.
214_58300000171747_ARA_EN_A – 01.03.a
Pressure switch
Pump
NTC2
Heater
5.2.4 Refilling
Solenoid valve
NTC1
When the "steam ready" display lights up, the user can extract steam.
To do this, press the switch in the iron handle, and the solenoid valve
opens to expel steam at high pressure. If the NTC2 temperature drops
below 145ºC, start the heating of the resistance, until NTC2
temperature is 145ºC or the pressure switch measures 4 bar. In this
way, the water from the inside of the boiler becomes steam, causing it
to lower the water level. If the water level falls below the NTC1 sensor,
the temperature increases rapidly. When the temperature reaches
180-190ºC, restarts the pump to fill the boiler with water.
Pressure switch
Pump
NTC2
Heater
Seite 19 von 39
NTC1