Published September 19, 2026 · 4 min read · MCL Electric
Flickering lights are the most common symptom we get called about, and the diagnosis follows a ladder: how much of the house is flickering tells you where the problem lives. Work through it the same way we do on site.
One bulb or one fixture
Cheapest rung. A loose bulb, a failing bulb, or — extremely common since the LED transition — an LED on a dimmer that was never rated for LEDs. Old incandescent dimmers chop power in a way cheap LED drivers hate; the cure is a compatible dimmer, a better bulb, or both. If a fixture flickers with a known-good bulb, the fixture's socket or its switch connection is suspect — a small, quick repair.
One room or one circuit
Now it's the wiring, not the bulb: a loose connection at a device on that circuit — an outlet or switch where a wire was back-stabbed instead of screwed down, a wirenut losing its grip, or (in 1965–73 houses) aluminum branch wiring loosening at devices. Loose connections build resistance, resistance builds heat, and heat is how flickers become warning signs. Worth a visit soon — this is the rung where waiting costs you.
The whole house — especially when big appliances kick on
Lights dipping when the AC or dryer starts can be normal if it's slight and brief. But whole-house flickering that's new, worsening, or random points at the panel, the main connections, or the utility service itself — including a loose or failing neutral, which is the one flicker cause that genuinely damages equipment and starts fires. Whole-house flicker is a call-this-week problem minimum; paired with any burning smell or a warm panel, it's a call-right-now problem.
A real one from our review page
One of our Google reviews tells the story better than we can: a customer called us after a previous electrician's work left "thousands of dollars of equipment destroyed" — flickering and failures traced back to butchered connections, which we repaired, in his words, "effortlessly back to great working condition." (It's on our reviews page, name attached.) The lesson isn't that we're heroes — it's that flickering is usually a connection problem, and connections are exactly where cut-rate work fails first.
What the visit looks like
Describe the pattern when you call — which lights, when, how long — and we can usually tell you the likely rung on the phone, free. On site it's diagnosis first, an upfront price before any repair, and a 1-year warranty on the fix. Our lead tech has been tracing flickers through Chicago plaster since 2000; there isn't a housing-stock era he hasn't opened up. Call (872) 378-0533 or email info@mclelectric.org — details on our troubleshooting & repairs page. Serving Chicago, Skokie, Park Ridge and the North Shore.