How to Troubleshoot Faulty Commercial Lighting Fixtures

How to Troubleshoot Faulty Commercial Lighting Fixtures


When commercial lighting fixtures start to fail or operate intermittently, it can negatively impact business operations and profits. As a facility manager or maintenance technician, it's important to understand common issues with commercial lighting and how to systematically troubleshoot and repair lighting equipment. In this guide, I will provide an overview of troubleshooting commercial lighting fixtures based on my 5 years of experience as an electrical contractor specializing in commercial buildings.

Common Issues with Commercial Lighting Fixtures

Here are some of the most common issues I've encountered with faulty commercial lighting fixtures:

Loose, Corroded, or Faulty Wiring

Faulty Lamps or Ballasts

Faulty Power Supply

Loose Fixtures and Faulty Components


Steps for Troubleshooting Commercial Lighting

Follow these basic steps when troubleshooting faulty commercial lighting fixtures:

1. Talk to Facility Staff

2. Visually Inspect the Fixtures

3. Check Power Supply

4. Isolate the Faulty Fixture(s)

5. Check Wiring and Connections

6. Test Components

7. Repair Loose Fixtures

8. Clean Dirty Fixtures

9. Evaluate Light Levels

When to Call a Commercial Electrician

While many lighting issues can be repaired in-house, it's best to call a licensed electrician for:

Commercial electricians have the expertise, equipment, and certifications to safely diagnose and repair commercial lighting fixtures. They can also advise on lighting upgrades and preventative maintenance.


Troubleshooting commercial lighting starts with understanding common issues like wiring faults, burnt out lamps, and faulty components. Methodically isolating the problem fixtures and testing components can help pinpoint causes. Address any loose fixtures, overheating, or dirty conditions as well. For large-scale repairs or electrical issues, contact a qualified electrician. With some basic electrical know-how and troubleshooting skills, facility managers can keep their commercial lighting shining bright.