The answer to 'dimmer switch burning smell' is that a burning odor from a dimmer switch is usually caused by an overheated or malfunctioning dimmer. This can be due to an electrical issue, such as a short circuit or overload, or a problem with the dimmer switch itself. Common symptoms include a burning smell, the switch feeling hot to the touch, or flickering/dimming lights.
If you notice a burning smell from a dimmer switch, it's important to shut off power to the circuit immediately and investigate the cause. This may involve replacing the dimmer switch, checking for loose connections, or addressing an underlying electrical problem. Attempting to DIY repairs on a malfunctioning dimmer switch can be dangerous, so it's generally best to call a licensed electrician, especially if you're unsure of the cause or don't feel comfortable working with electricity.