What does it mean if my burner flame is yellow instead of blue?
A yellow flame indicates that further adjustment is required. If the flame is completely or mostly yellow, verify that the regulator is set for the correct fuel type. After adjustment, retest the burner. Note that yellow tips on outer cones are normal for LP gas, while soft blue flames are normal for natural gas. (Page 10)
From the official Bosch NGT/NGP Gas Cooktop manual, page 10
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