A variety of burner problems can develop in a gas fireplace, leading to issues like a flickering flame or flame that gets too tall. Insufficient voltage, a failing thermocouple or malfunctioning thermostat are common causes of flickering burners. The burner or pilot may be dirty.
The major cause of a low flame is a clogged orifice. Spiders climb in when not in use and build webs. When the gas is turned on... the web is blown across the orifice opening. Typically the burner needs to be slid off the orifice for cleaning. Use a very small drill bit or pin or bristle of steel brush.
If the flames are abnormally uneven and soot residue begins accumulating, it probably means that your burners are dirty, your air to gas ratio is off, or your fire is not being ventilated properly.
One of the most common problems faced by homeowners with gas fireplaces is the pilot light going out or not staying lit. The pilot light is a small flame that ignites the gas burner, which produces the heat for your fireplace — if the pilot light goes out, your fireplace won't work.
If you see a small, continuously burning flame, that's the pilot light. Operating sound: Electronic ignition systems often make a distinct clicking sound when the fire is turned on, as it's sparking to ignite the gas.
Poor Draft: Things like blockages, creosote, and debris buildup – or possibly even small critters – can create a weak draft within the chimney. These things trap smoke and suffocate the fire, so your fire is likely dying before it really starts to heat your home.
Conclusion. When your gas fireplace won't light, it's important to address the issue promptly to restore warmth and comfort to your home. Common causes include problems with the pilot light, thermocouple, gas supply, obstructions, ignition system, gas pressure, and weather conditions.
Unbalanced Fire
One possible culprit is a clogged burner orifice, which is the opening where fuel and air mix to ignite the flame.
The flames in a gas fireplace come from a small series of holes designed into the burner, called 'ports'. These burner ports can be susceptible to clogging up with soot. Dust and dirt, tiny insect webs and small pieces of ceramic log material or glowing ember material will restrict the flow of gas through these holes.
Improper Draught
A good draught is essential for a wood fireplace to work properly. A draught is the flow of air that carries smoke and other by-products of combustion up and out of the chimney. If the draught is not strong enough, smoke can fill the room and the stove will not burn properly.
A healthy, properly burning flame on gas appliances should be blue in color, sometimes with a tiny tip of yellow, with a little light blue triangle at the center. This blue color flame indicates that there is safe, efficient and more complete fuel combustion.
Your gas fireplace could be turning off for several reasons. The most like culprits are likely tied to some kind of problem with your setup. Anything from issues with your pilot light, clogged ports on burners, damage to heating components, and thermocouple/thermopile malfunctions can be to blame.
A clogged or faulty burner can cause performance issues resulting in a low gas flame. In addition, carbon build-up, gas residue, and debris can inhibit the burner's ability to function correctly, leading to premature failure. If cleaning the burner doesn't solve the problem, it may need to be replaced.
Clogged burner ports, a failing gas valve, low gas pressure, or an igniter failure are the most common problems. If you have a low gas stove flame, it is important to resolve the issue to find the cause. Once the root cause has been identified, you can take corrective action.
Faulty thermostat, thermopile, or thermocouple.
Depending on the age of your unit, you'll have a thermostat or thermopile between your gas valve and pilot light that contributes to ignition. If it's loose or faulty, or if your thermostat is malfunctioning, it may prevent your fireplace from turning on.
Issues may arise from a variety of factors: creosote build up or other blockages in the chimney flue, insufficient ventilation, or negative air pressure within the home. These factors impact not only the heat of your fires, but also the safe usage of your fireplace system.
Soot buildup can be caused by several different factors, some of the more common ones are: Ceramic Logs that have been improperly installed or that have shifted can interfere with the flame path causing the gas not burn clean or properly.
If you notice signs of a gas line blockage, turn off your home's gas supply and call a plumber who specialises in gas line repair. The plumber can help you locate the source of the clog and clear it with a special probe or drain auger.