The orange glow is completely normal and what you describe is normal. Both of those heaters that you see come on 2-3 times a day for 15-30 minutes to melt all the ice that has accumulated on the coils you see. This is how the refrigerator is frost-free and if this doesnít happen the ice will build up to the point that it blocks all airflow. The refrigerator canít keep things cold with out airflow plus the ice acts as an insulator when it gets thick causing the temperature to rise first in the fresh food section then in the freezer.
I hope this answers your question and donít worry about the glow.