The answer to 'why is my dimmer switch sparking' is that a sparking dimmer switch is often caused by a loose connection, worn-out components, or an incompatible light bulb. Dimmer switches control the flow of electricity to the light fixture, and when they start sparking, it can indicate an electrical issue that requires attention.
Some common causes of a sparking dimmer switch include a loose wire connection, a worn-out dimmer switch, or a light bulb that is not compatible with the dimmer. If the dimmer switch is old or damaged, the internal components may be wearing out, leading to arcing and sparking. Additionally, using the wrong type of light bulb, such as an incandescent bulb on a dimmer designed for LED or CFL bulbs, can also cause the dimmer to spark.