Electrician Air conditioner repair

I have an Amcor PCMB10000EH Portable Air conditioner. I turn it on turn temp to lowest setting and compressor won't kick on since nothing is coming out of back exhaust. It also has a heater on the ac. i crank that to 90 degrees. compressor still doesn't kick on. it only blows room temp air on cold and on heat temps. it' not using the compressor just the reg fan is all that is engaging. My question is does this machine have a relay switch and where will it be located. and does it have a fuse and where is it located? I'm having issues. Please help me so my machine compressor can start working. Would low coolant, cause a compressor to not kick on? I have tools. I took apart the circuit boards. What can i do to make to compressor run? Can i bypass wires? 100 Dollars for the repair assistance if they ac works.