Why Is My Dimmer Light Flickering, and How Can I Fix It?

Dimmers can create a cozy ambiance, but most people aren’t exactly looking to install a strobe light in their living room. When lights start flickering, things can get a little bit annoying. Though LED bulbs are the most prone, other types of lighting (like halogen or incandescent bulbs) are not immune. This guide will help you determine why your dimmer light is flickering, what to do about it, and when it’s best to hire a professional.

1. Dying Light Bulb

Most LED lights last four to seven years with regular use. When LED light bulbs near the end of their lifespan, they may start to flicker. Some will flash on and off as they’re burning out, while others will slowly dim until they no longer emit light. 

How to Fix It

If your bulb is a few years old and nearing the end of its lifespan, changing the light bulb should stop the flickering.

2. Loose Light Bulb

Light bulbs can loosen from their socket over time. When the connection isn’t tight, your lights may flicker. This is especially noticeable with movement, like if you knock a hanging light or your lamp is on a table with uneven feet.

How to Fix It

Turn the light off and twist the bulb to tighten it in the socket. If a loose bulb was the problem, the flickering will stop when you turn it back on. 

3. Incompatible Bulb

Not every bulb is dimmable — especially if you're using LED lights. If the bulb isn’t dimmable, it will flicker and buzz when you try to dim it or just turn off completely. You may also notice flickering at the low end of the dimming range. Certain lights and fixtures are only designed to be dimmed a certain amount. 

Even if the bulb is dimmable, your lights may flicker if the total wattage of the bulb (or all bulbs attached to the fixture) is higher than the maximum wattage rating of the dimmer switch.  

How to Fix It

There are two ways to fix a compatibility issue depending on the cause:

• Replace the old bulb with a compatible bulb: Choose a bulb that’s rated for dimming and does not exceed the maximum wattage of your dimmer.

• Adjust the low end dimming range: If your bulb only flickers at the low end of the dimming range, some dimmers allow you to make a manual adjustment. Follow the manufacturer’s instructions to reset the level so it’s above the point where your light starts to flicker.

4. Wiring Issues

If the wiring to your dimmer or light bulb is damaged or loose, it can cause flickering. This is especially common in older homes that may have old aluminum wiring. You should have it fixed ASAP. Wiring issues can be a fire risk.

How to Fix It

Don’t DIY wiring. If you suspect there’s a problem with your wiring, call a licensed electrician. 

5. Incompatible or Faulty Dimmer Switch

Dimmer switches can wear down over time, and older dimmer switches may not be compatible with newer types of light bulbs. They’re typically designed for incandescent bulbs, not lower wattage LEDs. This won’t just cause flickering, it can shorten the lifespan of your bulb. 

How to Fix It

Install a new dimmer switch that’s compatible with modern light bulbs. If you use LED lights, make sure you choose a dimmer with a lower minimum wattage. The typical cost to replace a light switch is between $60 and $300. 

6. Overloaded Circuit or Electrical Panel

If you notice your lights flickering when you turn on an energy-hungry appliance like a clothes dryer or air conditioner, you may have overloaded your circuit or electrical panel. This is common in older homes that didn’t evolve to accommodate modern appliances. You may notice issues like flickering lights, a tripped breaker, or voltage fluctuations (where power rushes to one circuit and decreases from other circuits). 

How to Fix It

You’ll have to hire an electrician to find the source of the problem, but there are two potential fixes:

• For an overloaded circuit: If you have too many appliances wired into a single circuit, you’ll need to redistribute the appliances to different circuits or install a new one.

• For an overloaded electrical panel: You can upgrade to a newer panel with higher amperage. Many homes have 100-amp panels, but you may need to get a 200-amp panel.

When to Call a Pro

You can change or tighten a light bulb on your own, but if that doesn’t stop the flickering, it signals a deeper problem with your dimmer or electrical wiring. Unless you have a background with this type of work and deep knowledge of the safety protocols, never attempt to DIY your home’s electricity. It can be dangerous. A licensed local electrician will know how to accurately diagnose the problem and safely make a repair.