How Do I Know If My Surge Protector Still Works?

Your TV still turns on, and every outlet on the strip still works. So your surge protector must be doing its job, right? Not always. The part inside that stops power surges can wear out long before the outlets stop working.

That's why so many people ask, "How do I know if my surge protector still works?" It's a smart question for any Dallas home filled with TVs, computers, and smart devices. The good news is that most checks take less than a minute. You'll learn what to look for on plug-in strips and whole-house units, and what to leave alone.

First, we'll explain why surge protectors wear out without warning. Then we'll show you how to check a plug-in strip and a whole-house unit at your panel. We'll also cover when to replace them and how layered protection works. Finally, you'll see how our local team can check and protect your whole home.

Check the protection light first. Most surge protectors have a light that shows the protection is active. If it's lit, the protection is working. If it's off or shows a warning, the protection is used up, even if the outlets still give power.

Other signs your surge protector no longer works:

• Scorch marks, melted plastic, or a burning smell
• Outlets on the strip that no longer power your devices
• A major storm or power surge hit your home
• The strip is several years old

A whole-house surge protector at your electrical panel has its own status light. Light colors can vary by model, so check the label or manual to confirm what each one means. If that light shows a problem, a licensed electrician needs to replace the unit.

Want protection for your whole home, not just one outlet? See our whole house surge protection in Dallas.

Inside every true surge protector are small parts called MOVs, short for metal oxide varistors. When extra voltage hits, these parts absorb it before it reaches your devices. Each time they do, they wear down a little. Over time, they stop absorbing surges at all. Devices carrying a UL 1449 listing meet the standard for that protection.

Here's the tricky part. Once the MOVs are used up, power keeps flowing through the strip. Your lamp still lights, and your TV still turns on. You get no sign that the protection is gone unless you check.

One big surge can wear out a surge protector, and so can many small ones. Small surges happen inside your home every day. Your air conditioner, washer, and dryer can each cause one when they turn on and off.

Is it a surge protector or just a power strip? Many strips look the same, but not all of them stop surges. The Electrical Safety Foundation International (ESFI) warns that power strips do not provide surge protection. A power strip only adds outlets, so check the label before you count on it.

You can check most plug-in surge protectors in about a minute. Work through this list for each strip in your home. Start with the ones that power your TV, computer, and internet router.

• Find the protection light. Look for a light marked "protected" or similar. Check the label or manual to learn what each light color means on your model.
• Read the label. Look for a UL 1449 listing and a joule rating. If neither is there, it's likely just a power strip.
• Look for damage. Check for scorch marks, melted plastic, or a frayed cord. A burning smell means you should unplug it right away.
• Test each outlet. Plug a lamp or phone charger into each outlet. If one doesn't work, the strip is failing.
• Think about its history. How old is the strip? Has it been through a big storm or power surge?

Some strips also have a "grounded" light. If that light is off, the problem may be the wall outlet, not the strip. A missing ground can mean a wiring issue, so have an electrician check that outlet.

A whole-house surge protector lives in or right next to your electrical panel. In some homes, it sits at the base of the electric meter instead. It protects every circuit in your home, not just one outlet.

Most units have a status light you can see without opening anything. Check the label on the unit to learn what each light means. If the light is out or shows a fault, the unit is spent. Your power will still work normally, but your home has lost that protection.

Make a habit of checking this light after storms and power outages. Those are the times a big surge is most likely to wear out the unit. A quick look tells you where you stand.

Don't open your panel. The metal bars inside your panel stay live, even with the main breaker off. Wiring, testing, or replacing a whole-house surge protector is work for a licensed electrician. If the light shows a problem, call a pro instead of opening the panel yourself.

Checking your surge protector tells you where you stand. The next step is knowing when to replace it. Use this table as a quick guide.

Age is a rough guide, not a hard rule. Many electricians suggest replacing plug-in strips every 3 to 5 years. Whole-house units don't have a set lifespan. How long they last depends on how many surges they absorb.

Code now requires a surge protective device whenever your main electrical panel is replaced. Dallas follows the 2023 National Electrical Code, which took effect on May 23, 2025. So if you replace your panel, whole-house surge protection comes with it.

The strongest setup uses two layers of protection. The first is a whole-house surge protector at your electrical panel. It stops big surges before they reach your home's wiring. The second layer is plug-in surge protectors for your TVs, computers, and other electronics.

Plug-in strips can only protect what's plugged into them. They can't protect hardwired systems like your air conditioner, furnace, or dishwasher. A whole-house unit at your panel covers those systems, too.

Your home also creates surges of its own. Through a long Dallas summer, your AC turns on and off many times a day. Each cycle can send a small surge through your home. Over time, those small surges add up and wear down your electronics.

No surge protector can stop a direct lightning strike. But layered protection gives your home the best defense against the surges that happen far more often.

Many older homes in Lakewood and East Dallas have panels with no surge protector at all. If yours is one of them, you can add surge protection at your panel.

Bringing five decades of Berkeys expertise to Dallas, we help you protect your whole home from surges. You don't have to open your panel or guess what a status light means. Our licensed electricians check and set up the right protection for your home.

Here's how we work:

• Check your current protection. We look for an existing surge protector at your panel and check whether it still works.
• Check your grounding. A surge protector needs a solid ground to work. We make sure your home's grounding is up to the job.
• Install whole-house protection. We install a surge protector at your panel to cover every circuit in your home.

We'll also point out which electronics would benefit from plug-in surge protection. That gives you both layers of protection. If you're replacing your panel, we include the surge protector that code requires.

Have questions about your surge protection? Reach out to our local electrical team anytime. We answer calls 24/7. To check your home's wiring and grounding, too, you can schedule an electrical safety inspection.

Your surge protection only helps when it still works. Our licensed electricians check your current protection, test your grounding, and install whole-house surge protection at your panel.

We answer calls 24/7. Before you call, read reviews from Dallas homeowners about working with Berkeys in Dallas.

Berkeys Plumbing, A/C & Electrical

Business Address: 4311 Belmont Ave Suite 125, Dallas, TX 75204

Call (214) 612-0133 for whole house surge protection in Dallas.