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I. Uneven flame size or fluctuations: Caused by a clogged burner, a burner that is not aligned properly, or a nozzle that is not centered； Condensation water has accumulated inside the gas pipeline or stove. Exclusion method: Remove obstacles from the burner and trim the burner ； Turn on the condensate water within the switch for draining condensate water ； Flip the stove over to drain the water inside. II. Causes of flame separation from the burner: clogged nozzle, excessive pressure in front of the biogas stove, too much primary air ； The methane content in biogas decreases, resulting in a lower calorific value. Exclusion method: Increase the pressure in front of the burner, reduce the air control valve ； Remove obstructions from the nozzle ； Adjust the pH of the biogas fermentation broth, add new raw materials that produce more gas to the biogas digester, and increase the methane content in the biogas. III. The flame is long and weak, drifting from east to west. Cause of the problem: too much biogas is supplied and too little air, resulting in incomplete combustion of the biogas. Exclusion method: Close the biogas valve ； Adjust the air supply volume by opening the air adjustment valve ； Rotate the nozzle to produce a short, strong, light blue flame. IV. Causes of flame separation at the outer edge of the stove: After the stove has been in use for some time, the burners on the stove top become clogged, reducing their area and resulting in insufficient induction of primary air. Exclusion method: Flip the stove and gently shake the burner lid, or use a thin wire to pass through the blocked burner hole ； When it cannot be restored to its original state, a new fire lid should be replaced. V. Faults occurring when the stove is installed inside the combustion chamber, with flames escaping from the burner opening: the burner opening is too small, there is insufficient supply of primary air, and smoke cannot be discharged properly. Exclusion method: Increase the size of the furnace opening and use an appropriate pot type to ensure there is a certain gap between the pot and the furnace chamber, allowing smoke to escape.