How can you identify a properly functioning pilot light?

A properly functioning pilot light is indicated by a steady blue flame. This blue color typically signifies that the flame is burning efficiently and that the combustion process is occurring properly. A blue flame indicates complete combustion, which means that the gas is being used effectively, and there are minimal harmful emissions.

In contrast, a yellow or intermittently flickering flame may suggest incomplete combustion, which could result in the production of carbon monoxide and other soot-related issues. A pilot light that is completely out indicates a failure to ignite the gas supply, leading to potential issues in the functioning of the furnace. Therefore, the stability and color of the flame are critical indicators of the pilot light's proper functioning.