Flickering lights are often a simple loose bulb or an incompatible dimmer, but sometimes they signal a wiring problem worth taking seriously. This helps you work through the common causes safely and know when to call an electrician.
What you'll need
- Replacement bulb
- Ladder or step stool
- Gloves
Step by step
- Check the bulb firstTurn off the light, let the bulb cool, and make sure it is screwed in snugly. A loose or failing bulb is the most common cause of flicker.
- Try a different bulbSwap in a known-good bulb of the correct type and wattage. If the flicker stops, the old bulb was the problem.
- Confirm dimmer compatibilityIf the light is on a dimmer, check that the bulb is dimmable and matched to the dimmer. Non-dimmable or incompatible LEDs commonly flicker.
- Note when it flickersSee if lights dim when a large appliance like an air conditioner or dryer starts. Brief dips then are common, but constant flickering points to something else.
- Check the fixture connectionWith the power off at the breaker, make sure the fixture is firmly seated and wires are not obviously loose. Loose connections cause flicker.
- Escalate if it persistsIf flickering continues across multiple fixtures or comes with buzzing, warm switch plates, or a burning smell, stop and call a licensed electrician.
Handy tips
- Match LED bulbs to a compatible dimmer using the manufacturer's list to avoid flicker.
- Whole-house flickering, rather than one fixture, is more likely a wiring or utility issue.
- Keep a spare known-good bulb around to quickly rule the bulb in or out.
Heads up
- Flickering combined with a burning smell, warm outlets or switches, or scorch marks can indicate a fire hazard; shut off the circuit and call an electrician.
- Always cut power at the breaker before opening a fixture or touching wiring.
FAQ
Why do my lights flicker when the AC turns on?
Large appliances draw a surge of power at startup, briefly dimming lights. Occasional dips are normal, but frequent or severe flickering should be checked.
Can flickering lights be dangerous?
Sometimes. A single bulb is usually harmless, but flickering with buzzing, heat, or a burning smell can signal a wiring fault and needs an electrician.
Why do my LED lights flicker on a dimmer?
The bulb may not be dimmable or may be incompatible with that dimmer. Use dimmable LEDs matched to a compatible dimmer to fix it.