The gas fireplace consists of incombustible logs covering gas vents, and the fire itself burns behind glass doors. It gives off both radiant and convection heat and provides an experience similar to an open fire. One benefit of a gas fireplace is that it may help lower heating bills.

If at any moment when inspecting gas fireplace the area smells tremendously like gas, and you don't know where it is coming from, then you need to leave the area and get help immediately.

Is the Pilot Light Functioning:
One of the biggest problems associated with gas fireplaces is related to the pilot light. Often times a pilot light won't turn on, resulting in absolutely zero flames happening in your fireplace. A pilot light that doesn't glow blue is also a problem, as this means it is not getting hot enough. This piece is found on just about any gas appliance as it is the primary ignition source. To check if it is doing its job just open the vent and look to see if there is a small flame inside. If it is out, you might just need to merely relight it with a match or a lighter. Special types of extended match holders and long nozzle lighters specialize in just this sort of thing. If it doesn't stay on despite relighting or if the flame is burning too cool, then you probably have a more serious problem on your hands. For instance, excess moisture can build up in the gas line.

Check the Thermocouple or Thermopile:
Both the thermocouple and thermopile are used to generate electricity to light the fire and be a general sensor for the temperature. If either of these malfunction than the pilot light will not be able to do its job. The thermocouple is often found in older gas fireplaces and the number one issue related to these is that they aren't hooked up correctly, or not properly secured. Check the wires, screws, and tubing to see if everything is in the proper places. Thermopiles are a bit newer and are often found in the latest models of gas fireplaces. Because they generate electricity that is measured in millivolts, they are often called millivolt generators. Like their predecessor, their main problem is usually that they aren't hooked up correctly or have loose wiring. Replacement of these are difficult and should only be done when all other issues related to the fireplace are resolved.

Airflow and Chimney Issues:
Unless you have a vent less gas fireplace, you should have some sort of chimney attached. All chimneys regardless of what they are attached to act on a simple principle: Hot air rises, while cooler air drops. Gas fireplaces, if they ever are producing smoke can come from numerous areas, improper log alignment, dirty burners, misaligned screen, or negative air pressure within the home. Sometimes the issue can be with the chimney, stopping the warmer leftover gas from leaving the fireplace properly. Higher efficiency models actually have an issue that less efficient ones don't, in that there isn't enough heat being radiated through the flue, resulting in lower flue temperature. This can result in condensation building up inside the chimney itself. It is recommended to have a certified chimney sweep who is familiar with gas models to look at your fireplace at least once a year so they can prevent these problems. It is important to keep in mind that when starting a gas fireplace it may be necessary to slightly open a window or door for the first few minutes of lighting the fireplace to release any negative pressure within the home. This will allow the heat to rise and force the fireplace to draw.

Keep Everything Clean:
Not cleaning and upkeeping your fireplace can result in lower than average flame height, parts of the fireplace breaking down often, an even gas leaks. Taking the time a couple times a year to keep everything clean will greatly increase the lifespan and efficiency of your gas fireplace.

Reposted From: verticalchimney.com