A couple of things to check. Is your switch on the T-stat in either cool or heat mode? Is it a digital or analog T-stat? If switch does not fix the problem, you can remove it off wall and check with a meter to see if you are getting power and also check to make sure it is wired correctly.
Do a search on the forum for wiring diagram as this has been discussed before about changing out old analog to digital which I would recommend if yours is an analog. Digital controls better.
I'm sure some others can offer suggestions also.
Good luck.
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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