Upon arrival the upstairs system had no power and thermostat was blank. Went into attic to inspect unit and as I was removing the panel to the blower and board the system received power and thermostat kicked on and started calibrating. Waited for thermostat to finish calibrating and to fully kick on in cool Once it did I went back up and started inspecting wires to see what was causing it to turn off After receiving some help from supervisor to figure out issues we came to the conclusion that the control board has an issue that causes unit to shut off. Let homeowner know and he wants to order part and have it replaced Going to send part info to parts department and get it ordered Reschedule appointment to come install new parts No charge for service fee Holding for parts I tried to leave panel in a way that unit would stay on but advised homeowner that due to movement from unit it could shut off again. Let him know office would call to reschedule once part comes in. Per call note