The top box of the thermostat on our Fisher & Paykel E402B top fridge bottom freezer is flashing green all of the time. The fridge temperature is 19F and will not drop any lower. The freezer temp is ok. Also, if we lose power it beeps all of the time and we press the left hand button to stop it beeping which we presume is a reset button. How do we get the fridge temp to drop lower and why is the fridge thermostat light flashing all of the time? Many thanks.