The answer to 'dimmer switch buzzing noise' is that a buzzing or humming sound from a dimmer switch is a common issue that can have a few different causes. This usually indicates an electrical problem that requires attention to prevent further damage or safety issues.
Some of the most common causes of a buzzing dimmer switch include an incompatible light bulb, a faulty dimmer switch, loose wiring connections, or overloading the dimmer's capacity. The buzzing sound may be accompanied by flickering lights or the dimmer switch feeling hot to the touch. In most cases, this is a problem that should be addressed by a professional electrician, as tampering with the electrical system can be dangerous if you don't have the proper training and experience.