Gas fireplaces ofter all the ambiance of a wood-burning fireplace without the messy clean up of ashes. Gas fireplaces work via natural gas or propane that runs into the fireplace opening via a gas line and contains a valve that opens to light the gas logs. When the fireplace has not been used for extended periods, such as over the summer, air can seep into lines. To light the logs you must bleed the air out of the pipe.
Locate the gas shut-off valve, which looks like a colored lever and is near the fireplace. Open the flow of gas by turning the lever until it is parallel to the pipe. The gas shut-off may be outside the home or in a basement or crawl space.
Look inside the fireplace either near the front or on one side for a metal box. There will be a button, usually colored red or black, somewhere on the metal box. Push the button in all the way and ensure that a spark occurs at the pilot area. The spark will immediately extinguish without lighting the gas.
Look for another gas regulator knob located near the ignitor button. Push the button in and turn it until it reaches the words "pilot" or "ignite," depending on your model.
Push in on the gas regulator knob with one hand and push the ignitor switch repeatedly with the other hand. Continue this until you see the gas at the end of the ignitor spark and stay lit. This process is called bleeding the line and in some cases takes up to ten minutes before the flame ignites.
Continue holding in the gas regulator knob for 30 seconds after you see the pilot light flame appear. Then turn it to the "on" position. Locate the actual switch for the logs, which often looks like a light switch near the fireplace, and flip it on.