RVTI Level 2 Technician – Propane Practice Test

A yellow flame in a propane appliance typically indicates incomplete combustion, which can lead to the production of carbon monoxide (CO) and other potentially harmful emissions. Propane appliances are designed to burn fuel cleanly and efficiently, producing a clean blue flame under ideal conditions. When the flame appears yellow, it suggests that not all of the propane is being burnt properly, leading to soot formation and increased emissions of harmful gases.

The presence of a yellow flame often signals a problem with air-to-fuel mixture or burner operation, which, if not addressed, can pose health risks due to the possibilities of carbon monoxide poisoning. Therefore, running a propane appliance with a yellow flame is dangerous and highlights the urgent need for maintenance or adjustment to ensure safe and efficient operation. This understanding helps users assess the safety and efficiency of their appliances adequately.