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• Here are answers to the most common questions about dimmer switches. The Problem: The dimmer switch is buzzing or humming. The Solution: Update your dimmer rating. When humming or buzzing is coming from the dimmer itself, that may be a sign of an overload.

• Also, most older dimmer switches are not rated for use with LED bulbs, so be sure to pair the right bulb with your dimmer switch. CFL bulbs can also cause problems with your dimmer, so if you insist on using CFLs, make sure they’re rated as dimmable and your dimmer switch can pair with them.

• It can be normal for a dimmer switch to be a little warm when it is on, however if the switch is hot to the touch, it is likely that it is overloaded. There are a couple solutions that could remedy this.

All dimmers buzz a little bit. They "chop up" the AC waveform, which creates mechanical vibration (buzzing) and electrical noise (EMI). Usually they are the most quiet when the lights are fully bright, and get louder as you dim the bulbs. Hereis a good page that describes what is happening.

Here are answers to the most common questions about dimmer switches. When humming or buzzing is coming from the dimmer itself, that may be a sign of an overload. This means that the circuit connected to the dimmer switch is attempting to handle too much power.

Here are answers to the most common questions about dimmer switches. The Problem: The dimmer switch is buzzing or humming. The Solution: Update your dimmer rating. When humming or buzzing is coming from the dimmer itself, that may be a sign of an overload.

Old-style dimmer switches worked by interrupting the flow of electrical current passing from the switch to the light bulb by means of a variable resistor. The result is that the light bulb appears dimmer, but it actually takes more electrical current to divert the current through the resistor.