Fan wont run on auto for what ever reason my brand new unit....wont run in auto....however the fan will come on if i use manual on for fan then lower the temp...it cools fine but fan runs full time....if i switch it to auto once its running the fan stops, and the unit just starts humming..when i installed the unit i didnt bother hooking up the furnace wires to the ac unit..figured id run two t-stats then trying to chase wires through the walls... any ideas as to why the unit wont work in with the fan on auto setting ??

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Make sure your tstat is programmed for electric, not gas. Or in the settings you want that the TSTAT CONTROLS THE FAN.
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