Javelin's dig into the thermostat is good info IF this is a pre-owned RV and the A/C never worked. If the A/C has worked and now all of a sudden doesn't; it probably is not a thermostat problem especially since the furnace still works, so you know it is getting 12 VDC control power.
I'd pull the outside cover and open the electrical access and verify with a voltmeter that 120 VAC is making it to this area. Then either troubleshoot the A/C control relay, etc (if 120 VAC available) or troubleshoot why 120 VAC is not making it to the A/C (if no 120 VAC available).
The thermostat wiring could still be the problem (or the thermostat itself) if something there has just broke, but it's more likely a problem in the A/C itself.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
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