How to read the furnace flame
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A blue flame indicates peroxide combustion; a red flame signals a lack of oxygen; a bright flame denotes equivalent combustion. What causes a flickering flame? Is the wind strong or weak?
This is also related to the furnace temperature.
What is the fuel gas used by the poster? Do you mean the movement is erratic from side to side? Or?
First, check the pressure of the combustion air and reduce it appropriately; once the flame turns light blue and the furnace fire is stable, that’s fine. Also, check whether the main fuel supply is stable~~