To ensure that your GFCI outlets are working correctly its important to test them about once a month. Here are the steps to follow.
1. First, locate and press the TEST button with your finger. It should make a snap sound as the outlet connection trips, cutting the power off.
2. Confirm that the the power is cut off by plugging a lamp into each plug. The lamp should not turn on.
3. Once you have confirmed the GFCI has tripped succesfully, press the RESET button to restore power to the outlet.
If the test button fails to trip the circuit, or the outlet is still energized after pressing the test button, the outlet should be replaced.