is it possible the interconnects were mixed up?

U4 is an error in communication between indoor and outdoor units.

daikins have the "1,2,3" wiring, with off memory 1 is a premanent active, 2 being neutral, and 3 being a signal wire. if 1 and 3 were mixed up, would that possibly give a permanent active to the signal wire and possibly cause the condensor to continually run?

i dont know much about the internal workings of these units, just throwing something up in the air, some of the other guys on the forum will have a better idea.