What does an orange flame on a gas furnace mean?

An orange flame on a gas furnace typically indicates incomplete combustion, which can be caused by a dirty burner, insufficient air supply, or a malfunctioning component. This can lead to the production of carbon monoxide, a dangerous gas. It's essential to address this issue promptly by contacting a qualified technician to inspect and service the furnace to ensure safe and efficient operation. Regular maintenance can help prevent such problems.