Press the TEST button. You should hear an audible click, the light(s) should go off, and the RESET button will pop out slightly. This means the GFCI is doing its job and responding to a fault. Buttons ...

Locate the circuit breaker or fuse that controls the outlet you plan to replace and shut off the power to the circuit. Plug a lamp, radio or the GFCI tester into the outlet to test for power and make ...