I've requested your model number etc. on your other post.
The clicking noise from the rear is the relay on the main control board.
Unfortunately you'll need to replace this board and the front user board to cure the fault.
The problem with the freezer temperature may also be the rear board to blame again.
Unfortunately, to replace the two boards you are looking at around £300 for the parts.
I'd suggest calling Domestic and General and asking about a repair and warranty on the appliance. Check www.domgen.com to obtain full information and their phone number.
Hope this is of some help
Let me know if you need further advice.
If your machine is newer than 2003 then you may get away with just changing the rear board.
Hope this helps