How can you tell if an AFCI breaker is bad?

Determining whether an Arc-Fault Circuit Interrupter (AFCI) breaker has gone bad involves checking its diagnostic trip indicator lights, testing its response behavior, and verifying physical integrity. Many modern AFCI breakers feature built-in LED diagnostic blink codes or trip flags that indicate whether it tripped due to an arc fault, overload, or short circuit. If an AFCI breaker trips instantly under zero electrical load even after you have disconnected all appliances from the branch circuit, or if its test button fails to function when pressed, the internal electronic sensor circuit is defective. You can troubleshoot panel safety safely by avoiding bare components. You can verify that your corrective action is successful when having a licensed professional electrician test terminal continuity and replace a faulty AFCI breaker restores stable protection.