The answer to 'why is my dimmer switch' is that there are several common causes for a dimmer switch not working properly. This can include issues with the dimmer switch itself, problems with the wiring, or compatibility issues with the light bulbs you're using.
Some of the most common symptoms include the lights not dimming correctly, flickering, buzzing noises, or the switch not working at all. Potential solutions can involve replacing the dimmer switch, checking the wiring connections, or using compatible LED or CFL light bulbs. If you're not comfortable troubleshooting electrical issues, it's best to call a licensed electrician to diagnose and fix the problem.