No Heat: If your furnace isn't producing heat, it may have a faulty igniter or gas valve. Strange Noises: Unusual sounds, such as banging or rattling, can indicate mechanical issues or dirty burners. Frequent Cycling: If the furnace cycles on and off too often, it might be due to a faulty thermostat or airflow restrictions. Yellow Burner Flame: A yellow or orange flame can indicate... https://www.housetriangle.com/