The belt winder shows no function? Y. Beenen March 11, 2021 14:07 Updated Check the power supply incl. connection cable and connection plug. Related articles The roller shutter stops in the low position, what can be the cause? Overview of the different electronic belt winders How can I determine the weight of my roller shutter? Automatic functions cannot be activated, why? The roller shutter no longer goes all the way up, why? Comments 0 comments Please sign in to leave a comment.