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When using a gas appliance, you should normally see a clean, steady blue flame. If the flame turns yellow, orange, or flickering, it could be a sign that something isn’t working properly.
While it might seem like a small issue, a yellow flame can indicate incomplete combustion, which may affect appliance efficiency and potentially create safety risks.
If you’ve noticed a yellow flame on your cooktop, hot water system, or heater, here’s what you should know.
What Colour Should a Gas Flame Be?
A properly functioning gas appliance should produce a strong blue flame.
A blue flame means the gas is burning efficiently with the correct mix of gas and oxygen.
Signs of a healthy flame include:
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Blue in colour
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Steady and consistent
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Evenly distributed around the burner
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If the flame becomes yellow or orange, it usually means the gas is not burning as cleanly as it should.
Common Causes of a Yellow Gas Flame
There are several reasons why a gas flame might change colour.
1. Dirty Burners
Over time, burners can accumulate grease, dust, or food particles. This can block the small ports where the gas exits, disrupting the flame pattern.
2. Blocked Burner Jets
Gas appliances rely on tiny jets that control the gas flow. If these become partially blocked, the gas-air mixture can change, leading to a yellow flame.
3. Incorrect Air-to-Gas Ratio
Gas appliances need the correct amount of oxygen to burn efficiently. If the airflow is restricted, the flame may burn yellow instead of blue.
4. Appliance Wear and Tear
Older appliances or components such as regulators, injectors, or burners may begin to wear out over time, which can affect combustion.
Why a Yellow Flame Shouldn’t Be Ignored
A yellow flame may indicate incomplete combustion, which can produce soot and potentially harmful gases.
Potential issues include:
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Reduced appliance efficiency
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Soot build-up around burners
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Carbon monoxide risks in poorly ventilated areas
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If you notice soot, unusual smells, or headaches while appliances are running, you should turn the appliance off and have it checked by a licensed gas fitter.
When to Call a Licensed Gas Fitter
While some minor cleaning may help if burners are dirty, ongoing flame colour changes should always be inspected by a professional.
A licensed gas fitter can:
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Inspect the burner and gas jets
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Check the regulator and gas pressure
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Ensure the appliance is operating safely
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Service or repair the appliance if required
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Gas Appliance Servicing in the Sunshine Coast Region
At Gas Services QLD, we provide professional gas appliance servicing, installation, and repairs throughout the region.
Our services include:
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Gas appliance servicing
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Gas cooktop and oven installation
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Gas leak detection
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Gas hot water system servicing
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Gas regulator and gas line work
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If you’ve noticed a yellow flame or unusual behaviour from your gas appliance, it’s best to have it inspected before the issue worsens.
Contact Gas Services QLD today to book a gas appliance inspection.
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