How do I set the target temperature on the Rt20 RF thermostat?
Rotate the temperature knob clockwise to increase the temperature, or counter-clockwise to decrease it. The target temperature will be displayed on the LCD while being set, and the chosen temperature will be confirmed after the value flashes 5 times. The room temperature setting range is 3°C to 35°C. (Page 27)
From the official Bosch RT20 Rf Room Thermostat manual, page 27
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