Thank you for using Just Answer my name is Carl and I will help as best I can with your question.
I have a few suggestions.
I have come across ice makers not working before, If the ice maker is not getting water it could because the water tray is not filling.
At the back of the freezer, there should be a hose that goes into the ice maker remove the screw that holds the tubing in place, and gently pull out the hose.Let it sit for about an hour or so this pipe could be frozen once it has thawedput it back together and hopefully the water will flow again.
I am not overly familiar with this type of fridge I do worry if the compressor is running but it is not getting cold it could be something serious like a leak.
I found this site on fault finding your fridge.
I am afraid to say but you might need an engineer to call again and test the appliance properly.
not answered main problem - not freezing.! I have removed defrost thermostat from circuit now down to -12C [not 15+c as before] not tripping out now! 24 hours OK then started to defrost again [still only down -12c] fans working but had to reset defrost timer before it would start to freez again now15 hours down to -10c also found out ice maker will only start to fill when below -2c [bimetallic strip?] otherwise guess would get flood? Now ice maker working ok
I am trying to get a service manual for the appliance to see if that will help me understand why it is not freezing and when it does freeze it only freezes to -12. Do you have any other model numbers on it?I am struggling to find one with the 27adiw number.