My bathroom has a double switch plate: one for a fan and one for the light. I've replaced the light switch with a dimmer (Lutron Maestro Model# MACL-153M.) And I've also replaced the incandesent light with a 40" LED by Commercial Electric which is dimmable. The light won't power off, nor will it dim. It just stays on. Worth mentioning…there was no visible ground wire when I installed the switch. Only two wires were available to connect to my dimmer. So I capped the green ground wire coming out of the Lutron. Could this be why? (BTW, is this still considered a single pole even though the fan is attached to the same switch?)
Under ‘Important notes’ in the Lutron instructions, it mentions: When no ‘grounding means ‘ exists in the wall box, the…code allows a control to be installed as a replacement if 1) a non-metallic, non-combustible faceplate is used with non metallic attachment screws, or 2) the circuit is protected by a ground fault circuit interruptor. When installing a control according to these methods, cap or remove green wire before screwing control into wall box.