Okay, that's concerning and potentially dangerous. Sparks and a loud pop when pressing the test button on a new AFCI/GFCI breaker is NOT normal and suggests a serious problem. Here's a breakdown of what could be happening, why it's dangerous, and what you should do

Possible Causes:
Defective Breaker

This is the most likely scenario, especially since it's happening with a newly installed breaker. Manufacturing defects can cause shorts or arcing within the breaker when the test circuit is activated.

Wiring Error

Although you replaced them, there's a small possibility something happened with the wiring during the replacement. Rare as you would have likely noticed a discrepancy as you landed the conductors.

Faulty Test Circuit in the Breaker

The internal test circuit in the breaker itself could be malfunctioning, causing the arc/pop when activated.

Pre-existing Fault on the Circuit

It's possible there's an actual ground fault or arc fault condition already present on the circuit. However, the AFCI/GFCI should ideally trip before a visible arc/pop occurs. If the circuit has a fault, the test button may be exacerbating it.

Why It's Dangerous



Fire Hazard

Sparks and arcing are a primary cause of electrical fires.

Electric Shock Hazard

Any malfunction in the breaker could compromise its ability to properly protect against ground faults and potentially lead to electric shock.

Damage to Appliances/Devices

If the breaker fails to trip quickly enough, a fault condition on the circuit could damage connected appliances or devices.

What You MUST Do (Safety First!)


STOP Pressing Test Buttons! As you already realized, do not test any more breakers in this way.2. Turn OFF the Problem Breaker

Immediately switch the breaker that sparked/popped to the "OFF" position.3.

Call a Licensed and Qualified Electrician IMMEDIATELY

Do not attempt to troubleshoot this yourself unless you are a qualified and experienced electrician. This situation is beyond basic troubleshooting. Explain the problem clearly to the electrician, including that you observed sparks and a loud pop when testing.4.

Do Not Use the Affected Circuit

Until an electrician has thoroughly inspected the circuit and the breaker, do not use any outlets or devices connected to that breaker.

What the Electrician Will Likely Do



Inspect the Wiring

The electrician will carefully inspect the wiring connected to the breaker, ensuring it's properly installed and there are no loose connections, damaged wires, or improper grounding.

Test the Circuit

They will use specialized testing equipment to check for ground faults, arc faults, and other wiring problems on the circuit.

Replace the Defective Breaker

If the breaker is found to be defective (which is highly likely), they will replace it with a new one of the same type (dual-function AFCI/GFCI).

Verify Proper Operation

After installation, they will thoroughly test the new breaker to ensure it's functioning correctly and providing the intended protection.

Important Considerations



AFCI/GFCI Function

Keep in mind that AFCI (Arc Fault Circuit Interrupter) breakers are designed to detect and trip on arc faults (dangerous arcing conditions that can cause fires), while GFCI (Ground Fault Circuit Interrupter) breakers protect against ground faults (electrical current leaking to ground, which can cause shocks). Dual-function breakers combine both protections.

Testing AFCI/GFCI Breakers

The test button simulates a fault condition to verify that the breaker will trip. It is important to test these breakers periodically (typically monthly), but never if you observe unusual behavior like sparks, pops, or smoke.

Manufacturer Warranty

Check the warranty on the new breakers. If they are defective, you should be able to get them replaced by the manufacturer.

In summary, sparks and loud pops are a serious red flag. Turn off the breaker, and call a qualified electrician to inspect the wiring and replace the breaker. Do not risk your safety or your property by attempting to fix this yourself. Flag for review