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Is this a Dometic Single Zone thermostat?
Any chance this is set on the wrong temp scale? Double check that. If you don't have the User's Guide let me know.
Do you have the User's Guide?
See the attached link for a copy of that. Check the section on setting the temp scale. You may have this on the wrong one. If not, the temp sensor is defective. http://www.primetimerv.com/download/ComponentManuals/Thermostat-SingleZoneDigital-Dometic-OperatingInstructions.pdf
No. It has to do with choosing which temp scale you want to use.
See page 6
I have to step away from here for about 30 minutes.
I'm back........did you check the temp selection?