Why is my burner flame yellow instead of blue?

Bosch NGT/NGP Cooktop ·

A completely or mostly yellow flame indicates that further adjustment is required, and you should verify the regulator is set for the correct fuel type. Yellow tips on outer cones are normal for LP gas, while soft blue flames are normal for natural gas. Some yellow streaking during initial start-up is normal and should resolve after a few minutes of operation. (Page 10)

Source: NGT/NGP Cooktop Manual, Page 10

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