The glass breakage sensor is activated and is set too sensitive (sensor with lettering horizontal). Choose an alternative (quieter) position. Twilight function activated.
Glass and adhesive side of sensor are soiled.
Due to the angle of the sun, when the sun is high in the sky the curtain stops sooner, when it is low in the sky the curtain stops right by the sensor.
The sensor is in Manual mode. This function has not been activated (rotary switch set to 0).
The glass breakage function has not been activated.
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