Dimmer switch flickering lights

ElectricalUpdated March 2026

The answer to 'dimmer switch flickering lights' is that a flickering or blinking light when using a dimmer switch is usually caused by an incompatibility between the dimmer and the light bulb. This can happen when the dimmer switch is not properly matched to the type of bulb being used, or if the dimmer is old and not functioning correctly.

Some common causes include using an LED or CFL bulb that is not compatible with the dimmer, a dimmer that is not rated for the wattage of the bulb, or a dimmer that is failing due to age or damage. Flickering can also occur if the electrical connections in the dimmer or light fixture are loose.

Sources

Electrical Safety Foundation International— authority

National Electrical Manufacturers Association— authority

DIY Network Guide to Dimmer Switches— guide

Step-by-Step Guide

1
Try a different bulb type
If your dimmer is flickering, first try replacing the light bulb with one that is specifically designed for use with dimmers, such as an LED or halogen bulb.
2
Replace the dimmer switch
If the flickering continues, the dimmer switch itself may need to be replaced, which is best done by a licensed electrician.

Frequently Asked Questions

What types of light bulbs cause dimmer switch flickering?

Flickering is most common with LED and CFL bulbs that are not specifically designed for use with dimmer switches. Incandescent and halogen bulbs are usually less prone to this issue.

How do I know if my dimmer switch is compatible?

Check the packaging or specifications of your dimmer switch to ensure it is rated for the type and wattage of your light bulbs. Newer 'universal' dimmers are designed to work with a wider range of bulb types.

When should I call an electrician for a flickering dimmer?

If the flickering persists after trying a different bulb type, or if the dimmer switch itself appears damaged, it's best to call a licensed electrician to inspect and replace the dimmer switch. Attempting to fix electrical issues yourself can be dangerous if you don't have the proper training.

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