In extremely cold conditions, the control PCB will initiate the high fan speed and wait for the coil temperature to stabilise and stop dropping further. If the coil temperature drops and continues to drop, the control PCB assumes the fan is not operating and stop the unit and display a fan drive fault.
Unfortunately this machine does not perform well in cold climates where the humidity is high. Basically the majority of the energy is being spent turning the water vapor into ice on the condenser.
This came up a couple of years ago in ACT when we had an extremely cold and humid winter. There were no end of machines stopping on the fan drive fault. Especially those who switched the air conditioner on at 6AM (coldest and most humid time of the day) and opened all the zones on the installation.