How to Tell If a Circuit Breaker Is Bad: $150 to $250 Fix

Signs from HomeGuide's circuit breaker guide, ESFI and Bob Vila. Testing a breaker is done at an open panel: leave that to an electrician.

Do this now: if you think a breaker is bad

Do one safe check, one time, and stop there. Everything past it happens inside the panel.

1. Smoke, flames or a burning smell that is getting stronger? Get everyone out and call 911 from outside. Do not stop to look for the cause.
2. Hot, buzzing or scorched panel? Do not touch it or reset anything. Call an electrician now.
3. Unplug everything on the circuit and switch off its lights.
4. Reset the breaker one time: push the handle fully to OFF, then back to ON. Bob Vila warns that resetting again and again risks an arc flash.
5. If it trips again with nothing plugged in, or will not stay on, stop. HomeGuide lists both as signs of a bad breaker. Leave it off and call.

Is it an emergency? Signs a bad breaker needs help today

A bad breaker is an emergency when it comes with heat, smoke, a burning smell, sparks or buzzing. ESFI says sizzling or buzzing sounds and breakers that trip repeatedly are warning signs to call a qualified electrician right away, and NFPA counts an average of 31,647 home fires a year from electrical distribution and lighting equipment, as cited by ESFI.

• Leave and call 911: smoke, flames, or a burning smell that is getting stronger.
• Same day: a breaker or panel that is warm, scorched or buzzing; a breaker that will not reset on a circuit you need, such as a refrigerator, sump pump or medical device. See emergency electrician for after-hours rates.
• Can wait for a weekday visit: one breaker that trips now and then under a heavy load, with no heat, smell or sound.

Do breakers go bad?

Yes, breakers wear out: HomeGuide says most modern breakers last 15 to 20 years or more, and sooner in areas with frequent outages or power surges. InterNACHI's life expectancy chart gives arc-fault (AFCI) breakers 30 years and ground-fault (GFCI) devices up to 30 years, "much less if tripped regularly," and the service panel itself 60 years. Angi lists a faulty breaker or panel among the five causes of tripping, after overload, short circuits, ground faults and outdated wiring.

A breaker can also fail the other way, by not tripping when it should. That is the risk with some old panels: a team hired by the CPSC in the 1980s found that 51% of Federal Pacific Stab-Lok breakers did not trip in testing, according to an AmTrust insurance bulletin.

How to know if a breaker is bad, or if the circuit is the problem

The quickest way to tell is whether it trips with nothing plugged in: HomeGuide lists that as a sign of a bad breaker, while a trip only when several things run at once points to an overload, which Angi calls the most common cause.

• Trips only under load: likely an overloaded circuit. Angi's fix is moving a high-wattage appliance to another circuit. Breaker keeps tripping covers overloads, shorts and ground faults.
• Trips when one appliance starts: Bob Vila's test is to plug that appliance into a circuit in another room. If that breaker trips too, the appliance likely has a short.
• Trips with nothing on it, will not reset, or feels hot: the breaker or the wiring behind it. This needs an electrician.
• Lights dim or flicker with it: see lights flickering for what the pattern means.

How to test a circuit breaker, and why an electrician should

Testing a breaker with a multimeter is done at the panel with the cover off and the power on, so leave it to an electrician; a diagnostic visit costs $75 to $125 in HomeGuide's figures. ESFI's homeowner guide says to contact an electrician to diagnose a breaker problem that continues after a reset. The safe check from the outside is the one-reset test above: if the breaker trips with nothing on the circuit, you already have your answer.

Can I replace a circuit breaker myself?

Our answer is no: do not open the panel to replace a breaker. Call a licensed electrician. ESFI recommends a qualified, licensed electrician for any electrical work in your home, and HomeGuide, which says some homeowners do it where local codes allow, still recommends an electrician. The part is cheap, $5 to $30 for a standard single-pole breaker in HomeGuide's figures; most of the bill is the visit and labor, which HomeGuide puts at $95 to $350. Permit rules vary by city and state:

Examples only. Call your city or county building department before anyone works in the panel. Ask the electrician for the license number and check it in the state lookup.

To check an electrician's license, see the electrician license by state table, which links each state's lookup.

How much does it cost to replace a circuit breaker?

Replacing a circuit breaker costs $150 to $250 in This Old House's June 2026 guide, and HomeGuide puts the average range at $100 to $260 installed. The type of breaker and the visit fee drive the price:

HomeGuide's guide carries a June 2024 byline and is titled 2026. Prices include parts and labor unless marked part only.

When a bad breaker means a new panel

A bad breaker in a Federal Pacific or Zinsco panel usually means replacing the whole panel, which costs $1,500 to $4,000 in HomeAdvisor's 2026 data. HomeGuide calls both brands a fire risk to replace right away, and the AmTrust bulletin recommends replacing the panel rather than just the breakers. Any panel replacement averages $1,347 in HomeAdvisor's figures, with most homeowners spending $518 to $2,193. Prices, amp sizes and permits are on electrical panel replacement cost.

For hourly rates and what a visit costs, see how much electricians charge. If the house has old wiring as well as old breakers, the cost to rewire a house has the numbers. More electrical guides are on the electrical repair hub, with local pages for Houston, Phoenix and Denver. Calls go to an independent company that serves your area and takes this kind of job. How calls work.