Larry, I use a digital remote thermometer in my freezer very similar to yours, we do lots of boondocking, and the thermometer is a must to be able to monitor the freezer. I just moved the sending unit from the freezer to the refrigerator.....it says 36* in pic below, but that is when the fridge is set to 5, the coldest available.
I have tried both propane and electricity in the last couple of days, and there is no significant difference as far as I can tell....yes, we still have to open and close the door...so, getting something accurate is next to impossible without eating or drinking.
Will, that is pretty much what I thought, once it goes, it goes and there is no cooling. I will look into the PDF and see if their troubleshooting advice helps. If anyone else wants it, here is a link to the manual...
LINK
Thank you all for your help.