Arrived on site for no Cooling on the rooftop unit. Opened up the rooftop unit. Notice that the switch of the rooftop unit was not fully on. Forced it to go down to off and then flip it back on unit started up but then shut down. On the control board reason for shutdown was because compressor number one was on low pressure. Put on field pieces to check pressures on unit. Pressures were zero. Have to schedule a leak test,something blew.
