Mitsubishi Ductless Split Shut Off on OverCurrent Faults

I am working on a Mitsubishi Ductless Split that has gone off twice on overcurrent. It turns out the days it went off on overcurrent. The days it went off on overcurrent the morning started off around 15*F. The compressor was trying to slug liquid refrigerant and lock restored till it locked out. I found the sw1 preheat control function was turned off so I activated it. This works like a crankcase heater.