Why Are My Lights Flickering? 6 Common Causes and Fixes

Flickering lights are one of the most common electrical complaints from homeowners — and one of the most misunderstood. Sometimes it's a simple fix. Other times, it's a warning sign of a serious electrical problem. Here's how to tell the difference.

1. A Loose or Failing Bulb

The simplest cause. If a single bulb is flickering, try tightening it in the socket or replacing it. LED bulbs can also flicker if they're incompatible with older dimmer switches — this is especially common after switching from incandescent to LED.

2. Incompatible Dimmer Switch

Not all dimmers are compatible with LED bulbs. If you've recently switched to LED and your lights flicker on a dimmer, the dimmer may need to be replaced with an LED-compatible model. This is a quick, inexpensive fix.

3. Loose Wiring at the Fixture or Switch

If tightening the bulb doesn't help, the problem may be a loose connection at the fixture, switch, or junction box. Loose wiring is a fire hazard and should be addressed by a licensed electrician.

4. Overloaded Circuit

If lights dim or flicker when a large appliance (refrigerator, HVAC, microwave) turns on, the circuit may be overloaded. This is often a sign that the circuit needs to be upgraded or that a dedicated circuit should be added for the appliance.

5. Voltage Fluctuations

Consistent voltage in a home should be between 115–125 volts. Significant fluctuations can cause flickering throughout the house. This can be caused by issues with your utility's service, a failing main breaker, or problems with the service entrance wiring.

6. Loose Service Entrance Connections

The most serious cause of whole-home flickering is a loose connection at the service entrance — where the utility's wires connect to your home's wiring. This is a utility-side issue that requires immediate attention. If lights throughout your entire home are flickering, call your utility company and an electrician right away.

When to Call an Electrician

Call a licensed electrician if: flickering affects multiple rooms, you notice burning smells or discolored outlets, lights flicker when large appliances turn on, or the problem started suddenly and doesn't resolve with a bulb replacement. Behr Electric serves the Twin Cities and can diagnose flickering issues quickly and accurately.