Question

your LPG gas stove at home is giving a yellow flame . what does this mean

Answer 1

Yellow flames mean improper combustion in the burner. 

Answer 2

The LPG gas burns always with a clean blue coloured flame because it is a saturated compound but when the gas burners get blocks from somewhere the burner produces a sooty flame which is yellow in colour it means the gas coming out of the burner is an unsaturated compound
hope this helps you dear