Lights flicker for simple reasons, such as a loose bulb or an LED on the wrong dimmer, and for serious ones, such as a loose connection in a switch, the panel or the service. A single flickering lamp is usually minor. Flickering in many rooms, or lights that dim when large appliances start, should be checked.
Start with the simple causes
Many flickers have an easy answer. Check these first. They do not require opening anything.
A bulb that is not screwed in all the way. Turn off the light, let the bulb cool, and tighten it gently.
An LED bulb on an older dimmer switch. Many older dimmers were made for incandescent bulbs and can make LEDs flicker or buzz.
A lamp with a worn cord or a loose plug. Try the lamp in a different outlet.
A bulb near the end of its life. Try a new bulb of the right type.
When one fixture flickers
If a new bulb does not fix it and only one fixture flickers, the problem is likely in that fixture, its switch, or the wires that feed it. Connections in switches and fixtures can loosen over time. A loose connection can heat up, which is why it should not be ignored.
Leave the light off if it buzzes, smells hot, or the switch feels warm. Call an electrician to look at it.
When lights dim as an appliance starts
A short dip when the AC compressor, a microwave or a vacuum starts can be normal. Large motors draw a burst of power for a moment as they start.
It is worth a call if the dimming is strong, lasts more than a moment, or gets worse over time. That can point to an overloaded circuit, a loose connection at the panel, or a service that is too small for the home.
When flickering affects many rooms
Flickering across many rooms, or across the whole house, is a different matter. The cause is often in the panel, the meter, or the service wires coming into the home.
One cause electricians watch for is a loose or failing neutral connection. A loose neutral can make some lights brighten while others dim, and can damage electronics. That is a reason to call promptly, not to wait and see.
Other causes worth knowing
Flickering can also come from places you cannot see from inside the home.
Utility problems on the lines outside your home, especially during storms
An aging panel, including older brands such as Federal Pacific or Zinsco
Aluminum branch wiring with loose or overheated connections
Too many lights or appliances on one circuit
Signs it needs attention right away
Call an electrician soon if flickering comes with any of these signs.
A burning smell or a buzzing sound
Warm or discolored switch plates or outlet covers
Lights that get brighter than normal, not only dimmer
Breakers that trip often
Flickering throughout the house that does not stop
Check with your neighbors
If the whole house flickers, ask a neighbor whether their lights are doing the same. If they are, the cause may be on the utility side. Report it to your utility. If only your home is affected, the problem is more likely in your own service or panel.
Keeping a simple log helps
Flickering that comes and goes can be hard to track down. A few notes make the electrician’s job easier and can save time on the visit.
Which lights flicker, and in which rooms
What time of day it happens
Whether it happens when the AC, dryer or another appliance starts
Whether it is worse on windy or stormy days
Whether any breakers have tripped
Whether neighbors have noticed anything similar
Why older homes see more flickering
Many homes in Sun City and the older West Valley have decades of changes in their wiring. Connections at outlets, switches and the panel can loosen with years of heating and cooling. Some homes have aluminum branch wiring, which needs special care at connections. None of this means a home is unsafe, but it does mean flickering deserves a look rather than a shrug.
What an electrician checks
When our electricians look at flickering, they work from the simple to the serious. They check the bulb and fixture, then the switch and the wiring that feeds it. If many rooms are affected, they check connections in the panel, the main breaker and the service wires, and test voltage at outlets around the house. They explain what they find before any repair begins.
What to do next
Do not open the panel or remove switch plates to look. Parts behind them carry live power.
Call us at (602) 999-2770 and a real person answers, any hour. Describe what is flickering and when. We will tell you honestly whether it can wait for regular hours or should be looked at today, and you will hear the price before anyone drives out. Our work carries a two-year warranty on labor and material.
A burning smell, a hot switch or smoke is not a wait-and-see problem. Turn off the light at the breaker if you can do so safely. If you see smoke or fire, get out and call 911.
Common questions
Is it dangerous if my lights flicker?
One flickering bulb is usually minor. Flickering in many rooms, with buzzing, heat or a burning smell, can point to a loose connection and should be checked soon.
Why do my LED lights flicker?
The most common reason is a dimmer switch that was not made for LED bulbs. A dimmer rated for LEDs often solves it.
Why do my lights dim when the AC turns on?
A brief dip is common as the compressor starts. Strong or lasting dimming can mean a loose connection or a service that is too small, and should be checked.
