I have purchased two identical 4' flush mount LED lights and two identical dimmer switches. The first set I installed in the master bathroom works perfectly. The dimmer switch goes from very low light to very bright like just as it should. The second set in the upstairs bathroom will not dim at all. I have replaced both the light and the switch now and it still will not dim. What do I do to make the second bathroom work like the first bathroom?
Test the working dimmer on the light that won't dim... And test the non working dimmer on the light that you know will dim... to verify its not a bad dimmer or fixture.
Also try swapping the wires on the dimmer.... some dimmers require the hot to connect to a certain pole and the switch leg to connect to a certain pole. Some dimmers also have an optional third wire for a three way switch configuration, be sure you aren't using that one.