Propane and Butane flame colours

Jun 20, 2005
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My man cave Calor gas fire starts off with a lovely blue flame which after 5 minutes goes yellow. Not good. However I have cleaned the burners, vacuum cleaner. No difference. Is this a dealer issue or have I missed something stopping the correct combustion?
 

Damian

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Mar 14, 2005
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Yellow flames indicate the wrong burner mixture or damage to the burner bar.
Rust will cause this yellowing of the flame and the production of CO.
It needs a new burner .

Whilst you may have removed external rust you cannot get to the internal parts that will also have rust on them.