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Carrier thermostat buttons not working

Commercial central air with Carrier thermostat on wall. Buttons do not work. No air flow from overhead vent.
The thermostat for other part of office is working without problem.
This room may have had loss of power (when lights are left on, overnight security can turn off by flipping circuit breaker).
I don't know the model or year but it has the words:
"cool" on left with up and down button above and below the word "cool"
and "warm" with the same type buttons on the right side of the thermostat. There is a LED window in the middle alternately flashing these three things: 02 HF, 90 60 and the current temp.

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