Received a call that over the weekend during the warm weather that the condenser was not starting up, upon arrival turn down the system and I found that the condenser did start but then shut down. Upon further investigation I found that the pressure in the system was low and was causing the machine to go off on low pressure safety. The machine was running with a 1.6° sub cooling and a 42° superheat, I added 3 refrigerant to the system. The unit is now operating with a 5° sub cooling and a 23° superheat, The outdoor temperatures only 58° and we will need to confirm the charge on a little bit of a warmer day. The unit is operating and is cooling however we will need to perform a leak test to see where the refrigerant is leaking from. There is no diagnostic fee for coming out, we need to come back to perform a maintenance as well. During the maintenance we will perform an electronic leak test.