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Gas Fireplace Troubleshooting

Why Is My Gas Fireplace Making A Noise? 
Gas fireplaces will make some noise as part of their normal operation. However, there may be unusual noises caused by external issues. 
Rumbling or Roaring Noise: This could be an issue with your pilot light. Adjust the flame to see if this solves the issue. Also, ensure that your burners are clean; dirty burners can also cause this kind of sound. 
Grinding or Shrieking Noise: This could be an issue with your blower. 

Why Does My Gas Fireplace Smell? 
If your fireplace is new, there may be what is known as “off-gassing,” caused by residual factory paints burning off. This is harmless and should pass after a few fires. If the smell persists, check that your chimney is not obstructed and is cleaned. If you suspect the smell is gas, and the pilot light is on, you may have a gas leak. Shut off the fireplace, ensure your home is vented, and call your gas company or a professional technician. 

Gas Fireplace Soot Abundance 
Soot buildup is normal on vented gas logs, but not on vent-free units. In general, propane-powered fireplaces will produce more soot than natural gas fireplaces. If you notice excess soot build-up, here are a few common culprits. 

Why Is There Moisture/Condensation on the Glass? 
When you start your fireplace, you may notice condensation on your glass door as water vapor in the air inside the firebox evaporates. This should dissipate as the fire heats up. There may be some buildup over time of condensation residue, but this is easily wiped away. 

Improper Airflow 
Ensure that there is a proper ratio between the flame’s gas and oxygen; a flame that has too much gas will produce more soot. Follow the manufacturer’s instructions to increase oxygen and decrease gas flow. Note that this may cause the flame to appear more blue than orange. 

Improperly Arranged Firebox 
Make sure that the embers and logs in your firebox are arranged correctly and according to manufacturer specifications. If the logs are misplaced, they disrupt the flow of the flames, causing soot to be deposited. 

Clogged Burners 
Clogged or broken burners can also cause excess soot build-up. Ensure that they are clean and in working condition. If you’re not comfortable doing this, a local chimney sweep will be capable of servicing it for you. 

Chimney 
Make sure your chimney is clean and clear of obstructions. Common obstructions include bird nests, leaves, twigs, and branches. This article discusses obstructions in detail.

SOURCE: https://www.highschimney.com/reasons-gas-fireplace-working/