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Tell me what make and model t-stat?
carrier infinity video link
Cooling To select cooling, press the blue COOL button. Cooling is confirmed when the blue LED adjacent to the blue COOL button is lit. Cooling is operating when the blue LED is gradually pulsing on and off. (The LEDs can be turned off. For details, see ADVANCED SETUP – LIGHTING on page 30.) The programmed cooling temperature will appear in the lower right screen with the text, “COOL AT.”
Then procedures are to take some voltage measurement at the out door unit, can you do that?
You need a multi volt tester and locate the contactor in your AC unit outside and see it you get 24Volt when calling for cooling, |Attached is a picture of parts in question.
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