Testing a circuit breaker is a straightforward process you can do yourself, though interpreting the results — and fixing a faulty breaker — requires a licensed electrician. A healthy breaker should trip cleanly when overloaded, reset with a firm click, and hold its position without humming or heating up. If yours won’t reset, trips constantly, or feels warm to the touch, those are signs of a problem worth having a pro evaluate.

What You’ll Need Before You Start

Keep the process safe by gathering a few basics before you open the panel door: a non-contact voltage tester, a flashlight or headlamp, and rubber-soled shoes. Never test breakers in a wet basement or with wet hands. If your panel is older and you notice corrosion, a burning smell, or scorch marks when you open the door, stop — call a licensed electrician immediately rather than proceeding with any tests.

The Basic Trip-and-Reset Test

The simplest test is also the most informative. Turn off or unplug devices on the circuit you’re testing, then deliberately overload the circuit by plugging in a high-draw appliance (a space heater or hair dryer works well) and running it until the breaker trips. A good breaker will move cleanly to the OFF or middle “tripped” position. To reset, push it fully to OFF first, then back to ON — you’ll feel and hear a distinct click. If the breaker won’t stay in the ON position, trips again immediately, or the handle feels mushy with no clear click, the breaker itself may be failing.

Signs a Breaker Has Already Failed

Not every bad breaker announces itself with a dramatic trip. Watch for these red flags during or after your test:

  • Breaker trips repeatedly under normal loads — not just when you run everything at once
  • Won’t reset at all — stays in the tripped position no matter what
  • Feels hot to the touch — some warmth is normal under load, but hot means something is wrong
  • Audible buzzing or crackling from the panel when the breaker is on
  • Visible scorching or melted plastic around the breaker itself
  • Lights on the circuit flicker even when the breaker hasn’t tripped

Testing AFCI and GFCI Breakers

Arc fault circuit interrupter (AFCI) and ground fault circuit interrupter (GFCI) breakers have a built-in TEST button on their face — it’s usually small and labeled. Press it once: the breaker should trip immediately to the off or middle position. Reset it the same way as a standard breaker (fully off, then on). Colorado homes built or remodeled after 2014 are generally required to have AFCI protection in bedrooms and most living areas, so these breakers are increasingly common. Test them monthly — they protect against the electrical faults most likely to start a fire or cause electrocution.

When Testing Points to a Larger Panel Problem

A single faulty breaker is usually a straightforward replacement. But if you’re finding multiple problem breakers, noticing that the panel feels warm overall, or dealing with a panel brand that has a known history of issues, the conversation shifts from breaker replacement to panel evaluation. Denver-area homes with older Federal Pacific or Zinsco panels — still fairly common in neighborhoods built in the 1960s through 1980s — face a higher risk of breaker failure because those panels were never fully reliable to begin with. A licensed electrician can assess whether you’re dealing with isolated breaker wear or a panel that needs to be replaced.

If your breaker tests are turning up failures, or you just want peace of mind about your panel’s condition, the team at Done is ready to help. Visit our panels and wiring page to learn more about what a panel inspection covers, or check out our emergency electrician services if you’re dealing with a problem that can’t wait.