After your earthquake valve activates, your gas supply stops flowing to prevent leaks and fires. The valve stays closed until you manually reset it—it won’t automatically turn back on.Before resetting, you must inspect your property for gas leaks, damaged appliances, or broken gas lines. Check around your water heater, furnace, stove, and any other gas appliances for the smell of gas or visible damage.Once you’ve confirmed there are no leaks or damage, you can reset the valve following the manufacturer’s instructions. If you smell gas or find damage, call a licensed plumber immediately. Never reset the valve if there’s any possibility of a gas leak—the valve did its job by preventing a dangerous situation.