Lights Flickering or Dimming
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Quick answer: If it’s one light, a loose bulb is a simple cause: switch it off, let it cool, and tighten it (This Old House). If flickering affects multiple lights or rooms, comes with breaker trips, or happens when large appliances turn on, This Old House says to suspect loose wiring and contact a licensed electrician immediately.
⚠ Stop and call a licensed electrician if:
- Flickering affects multiple lights or rooms, breakers trip frequently, or lights flicker when large appliances turn on (This Old House).
- Lights dim or flicker without cause, or get brighter/dimmer when other appliances turn on or off (ESFI).
- A switch plate is hot or discolored, a switch leans or feels loose, or you smell an odor when using a switch (ESFI).
- Crackling, popping or buzzing from outlets, or shocks when operating a switch (ESFI).
Safe checks: easiest & free first
- Tighten the bulbFREE · 2 min
Turn off the switch, let the bulb cool if it was on, then gently but firmly tighten it in its socket (This Old House). - Use the right bulbFREE
ESFI: only use the appropriate watt bulb for a fixture; a larger-watt bulb may cause a fire. - Notice the patternFREE
Does it affect multiple rooms, happen when big appliances turn on, or come with breaker trips? Those are signs of loose wiring (This Old House) — go straight to an electrician. - Ease the loadFREE
Flickering, blinking or dimming lights are an overloaded-circuit warning sign (ESFI). Plug major appliances directly into wall outlets, not extension cords.
Watch it done
Video by This Old House on YouTube. FixCode Guide isn't affiliated with this channel.