Arrived at the customer’s home to find the cause of no cooling on the upstairs HVAC system. Tested heating and cooling from the thermostat. Found that the cooling is calling properly, but the outdoor unit is not kicking on. After cycling power, a few times, the A/C turned on. There were signs of a restriction in the line set, even when simulating higher temperatures. Measured the electrical component readings and refrigerant pressures. Measured the static pressure and counted up the ductwork. The system is technically cooling at this time, but it seems airflow and refrigerant issues may be contributing to possible pressure switch trips or compressor lockout. Reported findings to the customer.