A:Answer 1. Try to reset the unit. (Unplug for 1 minute and press and hold power button while it's off) that plug it back in and see if works.
2. If you are a bit handy and can get to compressor to tao it, it may work.
3. If none of the above works, I say don't waste your time and money and just get a new one. By the time you bring it to repair shop and pay for diagnostic just to find out it will cost 2/3 of a new unit to repair.