Hi Matt and welcome to the forum!
Refers work in strange and mysterious ways
I just sacrificed a number of mice to the gods of cool, and that seems to have worked in my case.
It's all about heat. Provided by a flame or elec element.
A pizo elec spark starts the flame, like a barbecue. A controlboard tells the spark to fire.
If you listen, you can here the clicking of the spark!
You can remove the sheet metal plate (2 screws) on the right lower side in the back of the refer to revel the burner , flame sensor and pizo elec sparker. Once reveled you can see what is happening. While there are many who have much more knowledge on this subject, this is a good way to start the diagnosis .