Thats why if you work on refrigeration you get calls for warm freezers when its 20 below outside. If theres not more refrigerant in the system than the condenser can hold, all the refrigerant will migrate to the condenser during the off cycle, and take on a pressure that corresponds to the outdoor temperature. When the solinoid opens on a call for cooling, the refrigerant will just sit there because it has no incentive to move to a warmer place (the freezer at 0 degrees). The compressor won't start because the pressure in the system is lower than the cut in point on the compressor. There needs to be enough refrigerant in the system so that there is always some in the indoor receiver or outdoor heated reciever if long off cycles are expected.