A yellow or flickering pilot light is a high-urgency warning sign that indicates incomplete combustion. Instead of a healthy, steady, crisp blue flame, a yellow flame suggests that the gas is not burning completely, which is a primary cause of carbon monoxide production.
There are several potential causes for this issue:
- Dirty Components: A dirty air intake or a dirty burner can disrupt the proper fuel-air mixture required for clean combustion.
- Airflow Issues: Obstructions or drafts can cause the flame to become unstable or flicker.
- Cracked Heat Exchanger: A yellow, flickering, or sooty flame is a key symptom of a cracked heat exchanger, which poses a severe safety risk as it can leak carbon monoxide directly into your home.
Because carbon monoxide is an odorless, colorless, and potentially deadly gas, you should never ignore a yellow pilot light. It is recommended that you turn off the furnace and call a professional technician immediately for a safety inspection.
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