LED Light Flickering? How to Fix Flickering Lights

Flickering lights can be more than just annoying—they can signal serious electrical faults. If you're wondering how to fix flickering lights, this guide explains the most common causes, how to troubleshoot them, and when it’s time to call in a licensed electrician.

Why Do LED Lights Flicker?

Light Emitting Diode (LED) lights flicker when there’s a break or instability in the power supply, which is an easy fix with the right tools.
The most common causes include:

  • Loose or damaged wiring can often be the cause of flickering problems.

  • Incompatible dimmer switches

  • Voltage drops from high-load appliances

  • Faulty or low-quality LED bulbs

  • Poor connections in the circuit

LEDs need a constant current. Even slight interruptions can cause visible flickers.

Is Flickering Dangerous?

Yes, it can be dangerous. A flickering light might seem minor, but it could indicate a loose connection, which can overheat and potentially start a fire. If multiple lights are flickering across different rooms or circuits, it could mean there's a problem at the switchboard or main supply.

What Tools Help Fix Flickering Lights?

Electricians use the following tools to diagnose and repair flickering:

Tool Purpose
Voltage tester Checks voltage stability and live wires
Screwdriver Opens fittings and tightens terminals
Multimeter Measures current, resistance, and voltage
Compatible dimmer Ensures proper LED dimming
Replacement LED bulb Helps isolate whether the bulb is faulty

📚 AS/NZS 3000:2018 Wiring Rules specifies that electrical tools and testing equipment must be used in accordance with safety standards.
Source: Standards Australia

Step-by-Step: How to Fix Flickering LED Lights

1. Start With the Bulb

Try swapping the flickering bulb with another one that works well elsewhere in the house.

  • If the new bulb works, the old one was likely faulty.

  • If it still flickers, it’s probably not the bulb—move to the next step.

2. Test the Light Fitting

Loose contacts inside the light fitting can cause inconsistent power flow.
Turn off the power at the switchboard, remove the fitting, and check the terminal screws are secure.

3. Check the Switch or Dimmer

Older dimmers often aren't designed for LED lights. This mismatch can cause flickering, especially at lower brightness levels.
Install a trailing edge dimmer rated for LEDs, or replace the switch entirely.

4. Look at the Wiring

Loose neutral or active wires in switches or junction boxes are a common flicker cause.
If you’re qualified, check connections yourself. If not, always bring in a licensed electrician.

5. Monitor for Voltage Drops

Appliances like air conditioners or fridges can cause lights to flicker when they start up.
This might point to an overloaded circuit or an issue with the main supply.
An electrician can test and balance the load.

Watch this video for a quick overview of why LEDs flicker:

 

Why Do Lights Flicker When Dimmed?

Dimming problems are one of the most common causes of flickering. Here’s why it happens:

  • LED drivers require a stable current, but old dimmers interrupt power flow.

  • Flickering often starts at low brightness or when the switch buzzes.

  • The fix is to install a modern dimmer that’s compatible with LED technology.

Common LED Flicker Scenarios and Fixes

Scenario Cause Fix
One light flickers Faulty bulb Replace with quality LED
All lights flicker on one switch Bad wiring or dimmer Check terminals and switch
Lights flicker with AC startup Voltage dip Install a voltage regulator or have an electrician assess the load distribution on the circuit
Smart LEDs flicker Firmware or signal issue Use the app to update firmware or reset the bulb to factory settings.
LED strip flickers Weak power supply Upgrade transformer or driver

When Should You Call a Professional?

Call a licensed electrician if:

  • Multiple rooms experience flickering (lights dim or brighten erratically)

  • Lights dim when appliances run

  • Outlets or switches feel warm

  • Buzzing, burning smells, or tripped breakers can cause flickering in light bulbs.

These signs indicate issues beyond DIY repair.

How to Prevent LED Flickering Long-Term

  • Use certified LED bulbs from reputable brands

  • Match your dimmers with the correct LED specs

  • Have a licensed electrician inspect and maintain wiring to ensure all connections are secure and safe.

  • Only use light fittings and components that meet Australian safety standards (e.g. Regulatory Compliance Mark (RCM) approval.

  • Monitor your power quality in older homes

Want to Fix These Problems Professionally?

If you enjoy solving electrical problems or want to start a hands-on career, the UEE30820 - Certificate III in Electrotechnology Electrician is the nationally approved pathway to become a licensed electrician in Australia.

As an RTO, we provide:

  • Real-world training 

  • Tools and materials included during practical workshops

  • Training on Australian Standards

  • Pathway to electrical licensing through state regulators

Ready to Start Your Career in Electrotechnology?

Fixing flickering lights is just one of hundreds of real skills you'll master.
Start your journey towards becoming a skilled electrician with UEE30820 - Certificate III in Electrotechnology Electrician.

👉 Enquire now to learn more about upcoming intakes, course price, and course structure.