It can be alarming anytime you notice something unusual related to your electrical system. A buzzing sound from your dimmer switch is one of those things.
The good news is that a buzzing dimmer switch may be annoying but harmless. The bad news is that it’s difficult for you to know whether this is a fire risk or something less serious.
In the article below, you’ll learn tips for diagnosing a buzzing dimmer switch and how to remain safe.
Quick Takeaways
- A buzzing dimmer is not necessarily dangerous, but it isn’t normal
- Most likely causes of buzzing are failing dimmers, load issues or incompatible bulbs
- Overheating or wiring problems may be present if the buzzing is loud and constant
- Replacing the dimmer switch sometimes works but professional troubleshooting is necessary for the correct solution
- Heat, flickering lights and burning smells are dangerous signs and you should stop using the dimmer switch
What a Buzzing Dimmer Switch Is Telling You
A dimmer switch works by adjusting the flow of power, or voltage, to the light switch. It makes this adjustment by interrupting this power flow.
That interruption can cause a vibration that creates a humming sound. This can be normal, especially if your switch is an older one.
A noticeable buzzing noise could be a sign of something more serious, including wiring problems.
Common Reasons Your Dimmer Switch Is Buzzing
The reasons for your buzzing dimmer switch range from minor and easily addressed to safety issues.
1. Incompatible LED or CFL Bulbs
Are you using regular non-dimmable bulbs? Even if you have dimmable bulbs in, they might be incompatible if they are LED and your dimmer switch is an old one. CFL bulbs are usually incompatible with old dimmer switches and often with newer ones as well, so LEDs are a better choice.
Some cheap LEDs use low-quality circuity. This circuity is also called the “driver,” and if your drivers are poor quality, this can cause a buzzing sound.
If the buzzing started after you changed bulbs, which is common, it may be because of one of these issues.
2. Dimmer Switch Not Rated for the Electrical Load
When the wattage of your bulbs doesn’t match the dimmer switch wattage, this can cause buzzing. Be sure to check the wattage minimums and maximums of your switch.
Buzzing doesn’t necessarily happen just because you are overloading the switch. If you have too few bulb, the switch can’t manage the current as well, and this may also lead to buzzing.
3. Old or Failing Dimmer Switch
Buzzing could be the first sign that the internal components of your dimmer switch are failing. Consider this especially if your switch is old.
4. Loose Wiring or Poor Connections
Spaces between connections can cause electrical arcing, which in turn creates vibrations that make a buzzing sound. This is a safety issue since loose connections and arcing may generate heat or sparks that lead to a fire.
5. Cheap or Low Quality Dimmer Switches
Dimmer switches that are higher quality have components that reduce noise, but these components may be left out of cheap switches. Mass produced builder grade dimmer switches are often both cheap and low in quality, so their components will degrade faster.
Is a Buzzing Dimmer Switch Dangerous?
A low buzzing noise may be a nuisance but is not a danger. If you have changed lightbulbs recently, you can check them and see if that’s the problem.
In addition, if your lights are flickering or the sound is loud or persistent, this can also mean your switch is unsafe. To be on the safe side, you can always have a professional take a look.
Signs Your Buzzing Dimmer Needs Immediate Attention
You may have an emergency on your hands if there is a burning or metallic smell. Other signs to look out for include a warm switch plate, increasingly loud buzzing or flickering lights.
If the lights cut off or the buzzing continues after you turn them off, this could also mean the problem needs immediate attention.
How to Stop a Dimmer Switch from Buzzing
You can try changing out your bulbs for new ones that are compatible with your dimmer switch. You can also try to reduce your electrical load if you have devices or appliances on that same circuit that you can plug in elsewhere. These are relatively easy fixes that almost anyone can do.
If you are a little more DIY savvy, you might be able to switch off the power, check for loose connections and tighten them. You might also be able to replace an outdated dimmer with a model that is LED-rated.
However, even if you feel relatively comfortable with DIY electrical work, it is best to call a professional for these types of fixes. There is always a safety issue when you are dealing with electricity.
When Buzzing Means You Need Electrical Troubleshooting
One advantage of contacting a professional is that they can perform troubleshooting that ensures that the problem is correctly identified. For example, repeated buzzing could point to circuit issues that require an electrical panel upgrade instead of simply plugging some devices into different outlets.
An electrician can also identify more complicated issues, such as wiring errors or shared neutrals. Shared neutrals refers to when a dimmer switch shares a neutral wire, which can cause buzzing or flickering lights.
How Electricians Diagnose a Buzzing Dimmer Switch
Electricians can verify the compatibility of your dimmer switch and your bulbs and check your wiring. With load testing, they can check the demand on your circuits.
They can also evaluate the overall safety of your circuits as well as perform safety compliance checks on your dimmer switch and electrical system.
FAQ
Why does my dimmer switch buzz only at certain light levels?
Dimmer switches operate by interrupting the wave or current. At lower light levels, this can create what is known as a “partial load.” This can distort the wave, create interference and cause vibrations, which in turn make that buzzing sound.
Is a slight hum from a dimmer switch normal?
Yes, a slight low hum is normal. If the hum is loud or more of a buzzing sound or if it’s a new sound, especially after changing light bulbs, there may be a problem.
Can a buzzing dimmer switch cause a fire?
Yes, if the buzzing is caused by loose wiring or connections, this can generate heat or sparks that may cause a fire.
Why did my dimmer start buzzing after installing LED bulbs?
If you have an older dimmer, it might not be compatible with LED bulbs. However, even if your dimmer is newer, you still need to use bulbs that fall between the minimum and maximum wattage for your dimmer. Divide your dimmer switch’s maximum rating by 10 to calculate how many LED bulbs at what wattage are compatible.
Should I replace the dimmer or call an electrician?
Any work that involves electricity is best handled by a professional for safety reasons. Furthermore, the dimmer switch may not be the issue, or there may be additional issues. Therefore, it is best to call an electrician to ensure that problem is correctly diagnosed and that your property is safe.
Schedule Electrical Troubleshooting Today
It can be tough for even an experienced DIYer to correctly identify the cause of a buzzing dimmer switch. That’s why calling a professional can help ensure that you get the right solution fast, preserving your safety and that of your property. We serve the Lakeland, FL and surrounding area.
You can count on Lakeland’s on-time electrician. Don’t put up with any malarky! For top-notch electrical troubleshooting in the Lakeland area, contact us today.