Go to the home's electrical breaker panel, and turn off all power to the GE PowerVent.
Turn the thermostat dial to the lowest temperature setting.
Press the manual valve down, and it will automatically turn counterclockwise into the "Off" position.
Check all gas line connections on the controller to make sure they are tight and secure. Then wait five minutes for all gas fumes to clear. If you don't smell any gas, go to the next step. If you smell gas, leave the building and immediately contact your gas supplier using a cell phone or neighbor's phone. Keep the electricity off.
Turn the manual valve counterclockwise into the "On" position.
Reset the thermostat to the desired temperature setting.
Go to the electrical breaker panel and turn power back on to the unit.