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A yellow flame on a gas boiler is a sign of incomplete combustion. This means that the boiler is not burning the gas efficiently and is therefore not working as it should. In some cases, it can even be dangerous. Fortunately, there are some simple steps you can take to fix the problem and get your boiler running safely and efficiently again.

The first thing to do when you notice a yellow flame on your boiler is to check the air supply. If the air supply is insufficient, the flame will be yellow and will not burn efficiently. Make sure that all air vents and openings are clear and that the air intake is not blocked. If the air supply is adequate, you should check the gas pressure. If the pressure is too low, the flame will be yellow and inefficient.

Next, you should check the burner. If the burner is dirty or clogged, it can cause the flame to be yellow. Clean the burner and check for any obstructions. If the burner is in good condition, you should check the gas valve. If the valve is not opening fully, it can cause the flame to be yellow.

If the burner and valve are in good condition, you should check the thermocouple. The thermocouple is a safety device that senses the temperature of the flame. If the thermocouple is not working properly, the flame will be yellow. You should replace the thermocouple if necessary.

Once you have checked all of these components and ensured that they are in good working order, you should check the flue for any blockages. A blocked flue can cause the flame to be yellow. If the flue is blocked, you should clean it out as soon as possible.

Finally, you should check the pilot light. If the pilot light is not lit, the flame will be yellow. Make sure that the pilot light is lit and that the flame is blue. If the pilot light is lit but the flame is still yellow, you should call a qualified technician to inspect the boiler.

These are the steps you should follow to fix a yellow flame on a gas boiler. If you follow these steps, you should be able to get your boiler running safely and efficiently again. However, if the problem persists, you should call a qualified technician to inspect the boiler and make any necessary repairs.