Replaced compressor on carrier Ultima 08 reefer. Runs, cools, heats fine. Problem is gets a p164 fault on the pretrip. Its been at the shop for weeks because they don't have the time to figure it out. Put new unloader in but didn't replace coil. Checked wiring to coil didn't find anything. At this point I bought a new coil and am going to replace myself. Is there anything else that I am missing?
