47
2018/02 Rev. 0.4
EN
OptiBean (XL) Touch
Dry boil protection
This double pole dry boil protection [1.4] protects the
heating element [1.3] against dry boiling. When the
switch detects a temperature above 135 °C, both
contacts switch off and disconnect the two heating
connections from the electric mains. Reset is only
possible after the boiler has cooled down and both
contacts are manually reset.
WARNING
• Always disconnect the machine from the mains, the
reset buttons are live!
If the dry boiler protection [1.4] is activated, the error 21
appears on the display after 6 minutes.
The reason for activating the protection can be caused
by air in the water mains, which is transported to the
boiler, or another malfunction of the heating system
occurs.
Temperature regulation
The heating element [1.3] is turned on when the water
temperature falls below the temperature setting. The
temperature in the water reservoir is measured using an
NTC precision sensor [1.1] mounted through the wall of
the boiler.
The heating element always switches off when the
maximum boiler temperature of 105 ˚C is reached. The
E6 error will appear on the display.
Reset
