Ground fault circuit interrupt, or GFCI, outlets are a safety device that break a circuit if a current imbalance occurs. They should be tested at least once a month. These outlets provide a "Test" and "Reset" button on them for easy testing of whether or not the circuit interrupt function is working. Resetting a GFCI outlet is required if the circuit trips or after you have tested the outlet, as the test button breaks the circuit.
Reseting a GFCI Outlet
Turn off any appliances plugged into the GFCI breaker. This ensures no appliance damage when re-engaging the circuit.
Locate the button next to the "Test" button that says "Reset" on it, and press it.
Turn the appliances back on to ensure the outlet works.