I take it the compressor stopped running beings it suddenly quit cooling. If so, make sure the power is off to the RV and check/repair all t-stat and power wiring. Check/repair connections and components on the control board. If none of that works remove the AC plastic cover and compressor elec. box cover and look for and replace any burnt wires/connectors or components. If everything looks OK, turn the power on and use a volt meter and amp clamp to track down the problem. If you can make repairs and save the AC, do a thorough cleaning of the coils, fan blade and blower wheel and comb the fins to keep it running up to snuff. I do mine every two years, max, if I've been using the AC very much. Craig