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If battery operated replace batteries. If not check breakers to make sure we have power to air handler. I am about to go eat but will be back shortly.WE will go from here.
Do you have a volt meter so we can do some troubleshooting?
Can you look in air handler,furnace to see if maybe there is a small auto type fuse on control board and if it is blown?
Remove panel on air handler itself,This will be a small fuse on board insdie air handler that Iam referring to.