The Mercator Ikuü light dimmer switches require a trailing edge dimmable load to be connected for it to function correctly. This load is required to calibrate the automatic power gauging function to the connected dimmable lights.
Under no circumstances should the above products be connected directly to neutral
Solution: the above products are not suitable to be used without a valid load. Consider using SSW01GN-ZB or SSW01GX-ZB for a 1-gang no-load switch solution.