WiremanWireman · Dual-function breaker trip indicators: troubleshooting for electricians · 2023 NEC ·
Dual-function breaker trip indicators
Read what the breaker says tripped it, then follow the cause: ground fault, arc fault or overload.
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How it works
A dual-function breaker combines an AFCI and a GFCI with the usual overload and short-circuit trip. Many can show which one caused the last trip, using an indicator light, a colored flag or a pattern you read by pressing a button in a set way. The method and meaning differ by manufacturer and model, so the breaker’s label or instructions are the only reliable key, but the causes fall into a few groups.
Every question and answer in this guide. Tap “Step by step” to walk through it.
- Read the indicator using the instructions on the breaker’s label or the panel door. What does it point to?
- Ground faultWhen does the ground-fault trip happen?
- As soon as any load turns onTest: Check how the circuit’s neutral is landed
- Circuit neutral on the neutral barThe circuit neutral is on the neutral bar
- Shares a neutral with another circuitA shared neutral (multiwire circuit)
- Wired correctlyNeutral touching ground somewhere on the circuit
- In rain or damp weatherMoisture causing current leakage
- With one applianceAn appliance leaking current or arcing
- As soon as any load turns onTest: Check how the circuit’s neutral is landed
- Arc faultWhen does the arc-fault trip happen?
- With one cord or applianceA damaged cord or appliance
- Randomly, with normal useA loose connection in the circuit
- Since recent drywall, nails or picture hangingA cable damaged inside the wall
- Overload or short circuitA standard overload or short-circuit trip
- No indicator, or it won’t reset at allUnplug everything on the circuit and turn off its switches. Does it reset now?
- Resets nowAn appliance leaking current or arcing
- Still won’t resetA fault in the wiring or a failed breaker
- Ground faultWhen does the ground-fault trip happen?