Square D afci_breaker Error Code AFCI Tripping

What does AFCI Tripping mean?

AFCI detects dangerous arcing in wiring or connected devices. Required by NEC for most residential circuits.

Common causes

• Arcing at loose wire connection in outlet, switch, or fixture
• Pinched or damaged wire under staple or door
• Damaged appliance cord
• Arc inside failing device (motor, compressor)
• Overly sensitive AFCI responding to motor startup

Diagnostic & testing steps

1. 1. Test with AFCI test button - should trip, then reset
2. 2. Remove all loads from circuit - if AFCI holds, fault is in an appliance
3. 3. With circuit off, inspect all outlets and switches for loose wire connections
4. 4. Check wire for damage at staples, door frames, or wall penetrations
5. 5. Use AFCI circuit analyzer to pinpoint arc location
6. 6. Tighten all wire connections to torque spec: #14 AWG = 20 in-lb, #12 AWG = 25 in-lb

Tools required

• AFCI tester
• Torque screwdriver
• Non-contact voltage tester
• Multimeter

OEM parts & part numbers

AFCI Breaker, Wire Connector (IDEAL or Wago)

Part numbers: QO115PDFC, HEPD30C

Safety warning

⚠️ FIRE RISK: AFCI trips indicate arcing conditions that can ignite building materials. Do not bypass AFCI or install non-AFCI breaker as replacement.