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The error code is usually caused by a restriction in refrigerant circuit.
1. Did you open service valves on unit(Silly question but I have to ask)
2. When you first start up, what do pressures do on gauges? (Does suction immediately go into a vacuum?)
Does unit work, just getting this error or is it actually shutting down on low pressure?
OK you most likely have a bad txv (thermal expansion valve) sticking and not allowing refrigerant to flow. If you can connect gauges and se if suction side is going into a vacuum, that will verify.
Let me know and we can go from here.
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