fridge doesn't work on propane.

A few things to check. First, bugs are attracted to propane. Check the path of gas, particularly, run a pipe cleaner through the burner tube. Second, the chimney will drop rust particles into and onto the burners.

Doing these two things fixed mine. Had to do them each year. It takes very little blockage to keep the fridge from getting maximum efficiency.

I have since added screen over my vent covers. This has definitely slowed down bug activity.