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my name is Billy.
Do you mind a test that involves removing the top section of the thermostat?
It is a bypass to see if the system works without the thermostat.
This tells us if it is thermostat related or something else.
Remove top section.
Locate wires on R, G, Y. Twist these 3 wires together.
Ac works = bad thermostat
Ac does NOT work = system fault
just respond as you can
We want to bypass at receiver end heading to furnace
power off at furnace will suffice