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Hahhaaha still don't know I'm not good at that kind of stuff but I call my service people thanks:)

C wire?

I cked no batteries and this is just a 2 yr old wall thermostat that was installed with the new a/c ? I will ck warranty and see if they will cover that. Thanks for all that responsed

Not sure if it even takes batteries? Just had service man out 2 weeks ago for a different issue I would think he might of checked that? Not sure

2 days ago my thermostat display went dark and blank no temp there. I have central air and heating. New unit was put in 2 yrs ago. It came back on by itself by morning. Now it went off again. Can...