Hello I have a Sharp split system AC unit, The compressor is not kicking into gear, Please tell me is the run capacitor on this unit is also the start capacitor? AY-A249J

SOURCE: Sharp AY-A249J air conditioner not cooling

Maybe get an electrician to make sure the voltage is not dropping to low at start up.

SOURCE: Compressor tries to kick in but then stops.

it is a hard start compacitor, the unit is not supposed to have three compacitors.

SOURCE: just had to replace contactor on a/c unit-split

Is the compressor trying to run. Make sure wires to capacitor or on the contactor correctly. Most of the time there is a red wire going to capacitor common tap C. The other wire on the same terminal goes to compressor. The other side of the contactor is the black wire to common on compressor. You might have terminal burnt off on your compressor Very simple repair. Let me know make and model and I can tell you more.

SOURCE: hello im trying to trouble shoot two split systems

E7 indicates an "External Feedback Problem" which sounds like a communication problem. I believe there is a sensor cable that runs from the outdoor unit to the indoor unit also. Check that all cables are properly run to the appropriate unit and check all connections for tightness. Here is the link to a manual that includes installation and wiring instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

SOURCE: AC compressor won't start

hi,you might need a new compressor...you will need need to go back were you bought capacitor...buy a hard start capacitor too..this might crank the compressor...hope this helps.if you buy it..call an ill tell you how to wire it...if it dont ,you need new compressor...call michael..doctor airr..appl.repair...843-384-8474...