AC Thermostat troubleshooting

[Sherrystrick]

We just purchased a 2004 Fleetwood Revolution that has (2) AC units; zone 1 & zone 2. This past weekend the ac was working fine the first day and the second day the ac was not cooling properly. The thermostat was showing zone 2 and then zone 3 (with an error message). We do not have a zone 3. Zone 1 was not even showing up on the thermostat and the unit was not working. Does anyone have a clue on the problem?

[RV Wizard]

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You need to do a reset on the T'stat. If you have a Comfort Control Center Tstat then with the T'stat off push and hold the top two buttons and turn the T'stat on. You should get FF on the display and then it will go to normal readings.
If you so not have this T'stat what kind do you have?