Upon arrival customer stated system has since came back on and began cooling. Found indoor temp displayed at 71 with a set point of 70. Tech monitored system operation and found everything to be operational. Found system running a high head pressure. Tech rinsed coils and had no effect on pressure. Inspected duct system, tested TXV. Tech found no challenges or any indications causing the high head pressure. System may have went out on high pressure switch. Tech stated to call if issue occurs again, system is cooling with an 18 degree delta t.