Breaker AFCI Troubleshooting Guide (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

An AFCI (Arc Fault Circuit Interrupter) breaker trips to prevent electrical fires. To reset, turn it fully off then on. If it trips again, disconnect devices on the circuit and test each one.

Confirm the symptom

Breaker labeled "AFCI" trips frequently
Power cuts to one or more outlets or lights
Breaker won't reset or resets then trips immediately

Tools and prep

Voltage tester
Screwdriver (flathead or Phillips, depending on breaker box)
Flashlight
Pen and paper to note circuit layout
Turn off power at the main breaker before working inside the panel

Step-by-step troubleshooting

Step 1: Turn Off the AFCI Breaker
Do: Flip the AFCI breaker to the OFF position.
Observe: Breaker moves to OFF.
Means: Breaker is now de-energized.
Next: Step 2: Turn Breaker Back On
Step 2: Turn Breaker Back On
Do: Move the breaker to the ON position.
Observe: Breaker stays on without tripping.
Means: Issue may be resolved temporarily.
Next: Step 3: Monitor for Tripping
Step 3: Monitor for Tripping
Do: Use the circuit normally for 1–2 hours.
Observe: Breaker remains on.
Means: No immediate fault detected.
Next: Step 4: Identify the Cause if Tripping Recurs
Step 4: Identify the Cause if Tripping Recurs
Do: Turn off the breaker and unplug all devices on the circuit.
Observe: Breaker stays off.
Means: Prepares for testing individual devices.
Next: Step 5: Test Devices and Outlets
Step 5: Test Devices and Outlets
Do: Plug in devices one at a time and turn the breaker on after each.
Observe: Breaker trips after plugging in a specific device.
Means: Faulty device or wiring is causing the trip.
Next: Step 6: Inspect Wiring and Outlets
Step 6: Inspect Wiring and Outlets
Do: Check outlets and wiring for damage, loose connections, or frayed cords.
Observe: Visible damage or loose wires found.
Means: Damaged wiring or outlets are likely the cause.
Next: Step 7: Replace or Repair Faulty Components
Step 7: Replace or Repair Faulty Components
Do: Replace damaged outlets or cords, or tighten loose connections.
Observe: No visible damage and connections are secure.
Means: Circuit should now operate safely.
Next: Step 8: Test the Circuit Again
Step 8: Test the Circuit Again
Do: Turn the breaker on and use the circuit normally.
Observe: Breaker stays on without tripping.
Means: Issue is resolved.
Next: Done

Common causes

Cause	Likelihood	Difficulty	Part often needed
Faulty appliance or device Arcing inside the device triggers the AFCI.	Common	Easy	Appliance repair or replacement
Loose or damaged outlet wiring Loose connections create arcs that AFCI detects.	Common	Easy–Medium	Outlet or wiring replacement
Damaged AFCI breaker Internal failure causes false trips or inability to reset.	Sometimes	Medium	AFCI breaker replacement
Overloaded circuit Excessive current draw can cause arcing.	Sometimes	Easy	None, if load is reduced
Moisture in outlets or wiring Water conducts electricity and causes arcs.	Rare	Medium	Outlet or wiring replacement
Old or deteriorated wiring Aging insulation can crack and cause arcs.	Rare	Hard	Wiring replacement

Parts matching

Common parts needed for AFCI breaker issues:

AFCI circuit breaker (match amperage and type to panel)
Outlet or receptacle (if wiring is damaged)
Voltage tester
Wire nuts and electrical tape
Replacement cords for damaged appliances

Always match the amperage and type of the original AFCI breaker when replacing it.

When to call a professional

Breaker trips repeatedly after testing all devices and outlets
You find damaged or deteriorated wiring in walls
The AFCI breaker won't reset at all
You're unsure about working inside the electrical panel
You smell burning or see visible damage in the panel

FAQ

What does an AFCI breaker do?

An AFCI breaker detects dangerous electrical arcs and interrupts the circuit to prevent fires.

Can I replace an AFCI breaker myself?

Yes, if you're experienced with electrical panels and follow safety steps. Otherwise, call a professional.

Why does my AFCI breaker trip even with no devices plugged in?

This may indicate a wiring issue in the circuit, such as a loose connection or damaged insulation.

How do I know if the AFCI breaker is faulty?

If it trips without cause or won't reset, it may be faulty and need replacement.

Can a GFCI outlet cause an AFCI breaker to trip?

Yes, if the GFCI outlet is faulty or wired incorrectly, it can cause an AFCI breaker to trip.