If a wall receptacle does not feature built-in test and reset buttons but is designated as a GFCI-protected location, it is typically wired downstream as a standard outlet fed by a primary GFCI receptacle elsewhere or protected by a specialized GFCI circuit breaker in your main electrical panel. To reset power to this type of outlet, you must locate the upstream master GFCI device—often found in a nearby bathroom, kitchen, garage, or outdoor wall—and press its reset button, or check your main breaker panel for a tripped GFCI breaker. You can troubleshoot unlabelled outlets safely using a voltage tester. You can verify that your corrective action is successful when locating and resetting the upstream master GFCI or breaker restores 120 volts to the dependent receptacle.
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