Siemens DE 18500 Notice D'utilisation page 8

To start Ideal temperature Program 1
To start Ideal temperature Program 2
To end Ideal temperature Program 1 or 2
To change the ideal temperature in Program 1 or 2
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Press button 1. The saved shower temperature in °C and P1
appears.
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Press button 2. The saved shower temperature in °C and P2
appears.
Both programs are active until either button 1 or 2 is pressed
(depending on the program selected) or until the temperature is
changed using the rotary knob.
The preset temperature for either Program 1 (= 40 °C) or Program 2
(= 60 °C) can be changed.
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Use the rotary knob to adjust the desired temperature between
30 °C and 60 °C.
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To save the change, press and hold button 1 for three seconds.
The selected temperature is now saved in Program 1.
Use the same procedure to change the temperature in Program 2.
To save the change, press and hold button 2 for three seconds.