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Unfortunately your problem may be a little hard to diagnose with the limited information you supplied. At the top of your screen there is a tab that says DIY Articles. Click on that then scroll down to AC Diagnosis - this will allow you to systematically test some components. Other than that we can just guess at things like:
Fuse is blown - CCU defaults to heat
Low on Freon -Compressor won't engage
Mono Valve Stuck Open.
The list goes on, but I think you get the idea.
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