A Ground Fault Circuit Interrupter (GFCI) safety outlet whose reset button refuses to stay pushed in and immediately pops outward indicates that the internal mechanical latch is failing to engage. The primary reason for this is a complete lack of incoming line power from the service panel, or an active ground fault, moisture intrusion, or short circuit present on the downstream load terminals. Without stable incoming power or with a fault present, safety logic prevents latching. You can troubleshoot latching failures safely by isolating power at the breaker. You can verify that your corrective action is successful when restoring incoming line power, eliminating downstream moisture or shorts, or replacing a failed GFCI allows the reset button to latch securely.
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