hvac - Why won't my A/C turn on after I replaced the thermostat batteries? - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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Our thermostat died yesterday, but after replacing the dead batteries with fresh batteries, and confirming the LCD screen was operable, our AC no longer turns on. I have attempted a factory reset

hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

How to Replace Your Own Furnace

7 day programmable - maintain the pre-set program schedule for up to 20% energy savings, or modify the schedule to fit your lifestyle. 208/240V

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

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hvac - Why won't my A/C turn on after I replaced the thermostat batteries?  - Home Improvement Stack Exchange

I've been through 4 thermostats and the HVAC tech says I need a