Hi-i Have A Bard 10 Seer C/a Unit. Am Able To Bring Unit On At Tstat.it Cools For About 20-30 Minutes. Then The Condenser Fan Stops & Hums Loudly. I'm Able To Turn Fan Manually But It Won't Kick The Unit Back On. Any Ideas? Thanks

Posibly a bad fan motor capacitor ( small canister looking device with two or more wires on it ,this is the cheapest thing to try if it is not bad then it is probably the motor. If the capacitor has a ballooned top, that is a sure indicator that it is bad. Good luck, Mike