Electrical problem
Why are my lights flickering?
Where the flicker happens tells you most of what you need. One lamp is a bulb or fixture problem. One room or circuit is a connection on that circuit. The whole house, especially with lights going brighter as well as dimmer, points to the service connection and needs prompt attention.
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Match the pattern to the cause
| Pattern | Likely cause | Action |
|---|---|---|
| One bulb or fixture | Loose or failing bulb, poor lamp socket contact, incompatible dimmer | Tighten or replace the bulb. Try a different brand of LED. Fit an LED-rated dimmer. |
| Lights on one circuit, at random | Loose connection at a switch, outlet, splice or the breaker | Book an electrical repair. Avoid heavy loads on that circuit. |
| Brief dip when the air conditioner, well pump or furnace starts | Motor starting current. A slight dip is normal | If the dip is deep or getting worse, have the connections and the motor's start components checked. |
| Whole house flickers together | Loose connection at the main breaker, meter or service line | Call the utility first, then an electrician. |
| Some lights get brighter while others dim | Failing neutral on the service | Urgent. Switch off sensitive equipment and call the utility's emergency line. |
| The neighbors' lights flicker too | Utility supply problem | Report it to the utility. |
The pattern that should never be ignored
A house receives two 120-volt legs that share one neutral. If the neutral connection fails, the two legs stop being held at 120 volts each.
Lights brighten when a large appliance starts
Voltage on one leg is rising above normal as the other falls.
Bulbs burn out quickly or electronics fail
Over-voltage damage.
It changes with wind or weather
A loose overhead connection moving at the pole or the house.
A tingle from taps or appliances
Current is finding other paths. Treat as an emergency; see emergency electrician.
LED lamps and dimmers
Most flicker complaints since the switch to LED lighting are compatibility problems, not wiring faults. Older dimmers were designed for the heavy, simple load of incandescent lamps. An LED's electronic driver can misread the chopped waveform, which shows as flicker, shimmer at low levels, a buzz, or lamps that glow faintly when off.
The cure is a dimmer listed for LED loads, matched against the lamp maker's compatibility list where one exists, and adjusted at its low-end trim. Mixing lamp brands on one dimmer also causes uneven behavior. See lighting installation.
Checks you can do safely
Swap the bulb
Move the flickering bulb to another fixture. If the flicker follows it, replace the bulb.
Note what else is running
Write down whether it coincides with an appliance starting.
Check more than one circuit
Look at lights on different breakers at the same moment.
Ask a neighbor
If they see it too, it is the utility's supply.
Do not open the panel
Loose service connections are found with instruments, by the utility and an electrician.
Flickering light questions
Is it normal for lights to dim when the air conditioner starts?
A brief, slight dip is common. A deep or lengthening dip suggests a weak connection, an undersized service or a compressor that is struggling to start.
Can flickering lights cause a fire?
The flicker cannot, but the loose connection behind it can. Connections that arc generate heat.
Who fixes a problem at the meter or the line?
The utility owns the line to the house and the meter. The homeowner usually owns the mast, the service cable and the panel. The utility will tell you which side the fault is on.
This page is general safety information, not a diagnosis. Electrical faults can cause fire and electric shock. If you are unsure whether something is safe, switch it off and have a licensed electrician inspect it.
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