AFCI Keeps Tripping

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Why Your AFCI Breaker Keeps Tripping

An AFCI (Arc Fault Circuit Interrupter) breaker is designed to detect dangerous arcing conditions that standard breakers can’t see. If it keeps tripping, the breaker is sensing arcing from wiring, outlets, switches, or appliances — or the breaker itself may be failing.

1. Loose or Damaged Wiring

Loose wiring is the most common cause of AFCI trips. When connections loosen inside outlets, switches, or junction boxes, they create small arcs that the AFCI detects instantly.

Learn more in loose wiring symptoms.

2. Damaged or Worn-Out Outlets

Older outlets can develop loose internal contacts. When plugs wiggle or lose connection, arcing occurs — and the AFCI trips to prevent overheating.

If the outlet buzzes, see buzzing outlet or switch.

3. Faulty Light Fixtures or Switches

Failing switches, dimmers, or fixtures can create intermittent arcs. LED drivers, fluorescent ballasts, and old switches are common culprits.

If lights flicker before the trip, review lights flickering.

4. Damaged Appliance or Power Cord

Appliances with worn cords, failing motors, or internal shorts can trigger AFCI trips. This often happens when the appliance is turned on or plugged in.

5. Shared Neutral Issues

Improperly wired circuits that share a neutral conductor can confuse the AFCI and cause nuisance tripping. This is common in older homes or DIY wiring.

6. Arc Faults Behind the Wall

Arcing inside walls — caused by rodent damage, nails through wires, or deteriorating insulation — can cause repeated AFCI trips. This is a serious condition that requires immediate attention.

7. AFCI Breaker Failure

AFCI breakers can wear out over time. If the breaker trips with no load or won’t reset even after unplugging everything, the breaker itself may be defective.

For more help, see breaker won’t reset.

8. Interference From Certain Devices

Some older electronics, treadmills, vacuums, and motor-driven tools can create electrical noise that AFCIs interpret as arcing. This is less common with modern AFCIs but still possible.

When AFCI Tripping Becomes Dangerous

Stop troubleshooting and call an electrician if you notice:

  • Burning smell or warm outlets
  • Popping or crackling sounds
  • Trips that happen immediately after resetting
  • Discoloration around outlets or switches

When to Call an Electrician

If the AFCI continues to trip after unplugging devices and checking obvious issues, the problem may be wiring-related or internal to the breaker. A licensed electrician can test the circuit, inspect connections, and replace faulty components safely.

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