Electrical guide
Why are the lights flickering in my house?
Flickering lights can be a loose bulb or a warning sign of a loose connection. How to tell the difference and when flickering is a fire hazard.
A light that flickers now and then is easy to ignore. Sometimes it's harmless. Sometimes it's the first sign of a loose connection that's heating up behind a wall. The pattern of the flicker tells you a lot about the cause.
If only one light flickers
- A loose bulb: turn off the light, let the bulb cool, and tighten it.
- A failing bulb: LED bulbs can flicker as their internal drivers age. Try a new bulb.
- An LED on a dimmer: many older dimmers were made for incandescent bulbs. Use bulbs labeled dimmable and a dimmer rated for LEDs.
- A loose connection: if new bulbs don't help, the problem may be a loose wire at the fixture or switch. That needs an electrician.
If lights flicker when the AC, dryer, or another big appliance starts
A large motor pulls a surge of current when it starts. A brief, slight dim is normal in many homes. A noticeable flicker every time the air conditioner kicks on, which North Texas homes do many times a day through the summer, can point to an overloaded circuit, a weak connection at the panel, or a service that's undersized for the home's current loads. An electrician can measure the voltage drop and find where it's happening.
If lights flicker across the whole house
This is the one to take seriously. Flickering in several rooms at once, especially with lights getting brighter and dimmer, often means a loose or failing connection in the main panel, the meter base, or the service wires, including the main neutral. A bad neutral can send uneven voltage to different circuits, which can damage electronics and overheat wiring.
Check whether your neighbors are seeing the same thing. If they are, the problem may be on the utility's side; call your electric utility, such as Oncor or your electric cooperative. If it's only your house, call an electrician.
Is flickering a fire hazard?
It can be. A loose connection creates resistance, and resistance creates heat. Over time that heat can damage insulation and start a fire inside a wall or box. Flickering by itself isn't proof of a hazard, but flickering together with any of these signs is a reason to call an electrician right away:
- A burning or hot plastic smell
- Outlets, switches, or the panel cover that feel warm
- Buzzing, crackling, or sizzling sounds
- Scorch marks on outlets or switch plates
- Breakers that trip often
- Lights that get noticeably brighter, not just dimmer
Older homes
Homes with aging panels, aluminum branch wiring, or decades of additions are more likely to have loose or deteriorating connections. If your home is older and you're seeing flicker in more than one room, a full inspection of the panel and connections is worth it.
What an electrician will check
An electrician will test voltage at the panel and at affected circuits, tighten and inspect connections at the panel and meter, check the main neutral, look at the load on each circuit, and tell you whether you need a repair, a dedicated circuit, or a service upgrade. Koryente provides electrical troubleshooting for homes in Van Alstyne, Anna, Sherman, McKinney, and nearby towns.
Common questions
Should I be worried if my lights flicker?
If one light flickers, it's usually the bulb or a dimmer mismatch. If lights flicker in several rooms, get brighter and dimmer, or come with burning smells, warm outlets, or buzzing, have an electrician check it soon.
Can a bad breaker cause lights to flicker?
Yes. A worn breaker or a loose connection where the breaker meets the panel can cause flickering on that circuit. An electrician can test and replace it.
Why do my lights dim when the AC turns on?
The AC compressor draws a surge of current when it starts. A slight, brief dim can be normal. A noticeable flicker every time can mean an overloaded circuit, a loose connection, or an undersized service.
Why do my LED lights flicker?
Common causes are a dimmer switch that isn't rated for LEDs, bulbs that aren't dimmable, or aging LED drivers. Try dimmable LED bulbs and an LED-rated dimmer.
Is it the utility or my house?
If your neighbors' lights flicker at the same time, the problem may be on the utility's lines. Call your electric utility. If it's only your home, call an electrician.
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