Lights Flickering in House

Flickering lights are among the most common electrical complaints, and the causes range from simple to serious. Understanding what's normal and what's concerning helps you know when to call an electrician.

Some flickering is normal. When large motors start (refrigerator, AC, washer), they draw a surge of power that can momentarily dim lights on the same circuit. This brief flicker that corresponds to appliance startup is typically harmless.

Concerning flickering includes: persistent flickering that doesn't correspond to appliance use, flickering throughout the house, flickering accompanied by buzzing sounds, or flickering that's gotten worse over time. These symptoms often indicate loose connections somewhere in your electrical system.

Loose connections are the most common cause of persistent flickering. As connections loosen, current must arc across gaps, causing inconsistent power delivery and flickering. Left unaddressed, loose connections generate heat and can cause fires.

Utility issues can also cause flickering, especially if neighbors experience the same problem. Voltage fluctuations from the power grid affect all homes in an area and require utility company intervention.

LED bulbs can flicker when used with incompatible dimmer switches. Traditional dimmers are designed for incandescent bulbs and may not work properly with LEDs. Installing LED-compatible dimmers often solves this issue.