Flickering lights
Flickering can be limited to one fixture or affect more of the home. The pattern matters.
Flicker is information. How much of the house participates, and exactly when, sorts the harmless causes from the urgent ones, often before anyone opens a panel.
Count what flickers
- One bulb or one fixture: the bulb, its socket, or that fixture's own connection. Swap the bulb before anything else.
- Everything on one switch or in one room: a shared connection or splice on that circuit.
- Lights all over the house: the service itself, meaning the panel, the main connections, or the utility's side. A different league; treat it as urgent.
LEDs and dimmers often disagree
An LED bulb on a dimmer designed for incandescent lamps will shimmer or strobe, worst near the bottom of the dimming range. That is a compatibility mismatch, not damaged wiring.
The cure is an LED-rated dimmer matched to its bulbs, small work under lighting installation and upgrades. Shimmer confined to dimmed fixtures, only while dimmed, nearly always lands here.
Dips when big loads start
A brief dimming when the furnace, a compressor, or a vacuum kicks on is motor inrush, the heavy gulp of current at start-up, and a small momentary dip is ordinary. Dips that have grown deeper over months, or that reach rooms far from the appliance, have outgrown ordinary and deserve investigation.
Brightening is the serious tell
Lights that swing brighter and then dimmer on their own are the signature of a loose or failing neutral, the conductor that keeps the two halves of a home's service in balance. When it loosens, one side of the house can ride high while the other sags, and the high side overvolts everything plugged into it.
That connection can also build heat where it is loose. Unplug sensitive electronics and treat random brightening as urgent; anything hot-smelling or scorched at the panel makes it a 911 call instead.
When the utility owns the flicker
If the neighbors' lights flicker in rhythm with yours, or the whole street dips when the wind picks up, the fault is out on the lines. Report it to the utility. Part of diagnosing whole-house flicker is establishing which side of the service point the problem lives on.
Bring the pattern, not just the complaint
Note which rooms flicker, whether dimmers are involved, which appliances coincide, and whether weather matters. With that pattern in hand, troubleshooting starts at the likely cause instead of the whole house.
Send the details with Request an Estimate, or reach us at (206) 718-3047.
Common questions
My LEDs flicker only when dimmed. Is the wiring bad?
Probably not; that pattern points at a dimmer not rated for LED loads or a poor dimmer-to-bulb match. It is worth fixing for comfort, and it is not the danger case.
Lights dim for a second when the furnace starts. Is that a problem?
A slight momentary dip on motor start-up is normal in most homes. It becomes worth investigating when the dips deepen over time, spread to distant rooms, or arrive with breaker trips or warm devices.
The lights surged brighter for a moment. What was that?
A brightening swing means voltage rose, which ordinary switching does not do; suspects include a loose neutral on the service or an event on the utility's lines. If it repeats, unplug sensitive equipment and have the service connections checked promptly.
Who handles flicker the whole street can see?
The utility; shared flicker means a shared cause on their lines or transformer. Report what you saw and when. If your house keeps flickering after their check, the remaining suspects are on the home side.