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The controls for both of those units are 12 VDC powered. This may be a battery issue or lack of adequate charging. If the DC voltage drops below 11 VDC they won't work. It may be the thermostat IF both are on the same unit. IF SO, please give me the make and style of the thermostat. Digital or slide control? Get back to me with this and the make of the A/C and furnace would be helpful as well. There should be manuals in the coach or trailer that would tell you that. All follow ups are included in our fee.
Not sure if you may have missed my response on your question or if you were able to get this resolved?