Lights Keep Flickering
Why your lights flicker, what's normal, and what's a warning sign of loose wiring, a failing neutral, or utility trouble.
Occasional flicker on a single fixture when a big motor starts (AC, well pump, laser printer) is often normal. Whole-house flicker, worsening flicker, or flicker with brownouts or burning smells is not — it usually points to a loose neutral at the panel, meter base, or utility drop. Here's how to tell the difference.
Key details
- Single-fixture flicker: usually a bad bulb or dimmer
- Room-wide flicker: often a loose connection at a receptacle or switch
- Whole-house flicker: bad main neutral (utility or panel)
- Brownouts + flicker: serious — call same day
- Burning smell + flicker: emergency — call immediately
- LED flicker with old dimmers: incompatible dimmer
The single most dangerous cause: a bad neutral
A loose or corroded main neutral at the meter base, service entrance, or utility transformer causes 240V loads to shift voltage between the two 120V legs. Symptoms: half the house dims when the other half brightens, appliances burn out, LEDs flicker at random. This is a fire and equipment-damage risk — call immediately.
The most common annoying cause: dimmer/LED mismatch
Older dimmers designed for incandescent lamps don't play well with modern LEDs. Result: buzz, flicker, or won't dim below 30%. Swap for a Lutron Diva LED+ or Caseta dimmer rated for LEDs — fixes 90% of these cases.
When it's a loose connection
Flicker isolated to one room, one fixture, or one wall is often a loose backstab receptacle, a worn switch, or a loose wire nut in a ceiling box. Easy fix for a licensed electrician, dangerous if left alone.
Lights Keep Flickering — FAQs
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