Zanussi ZK87/46EFS Fridge Freezer
The same symptom occurred in our fridge freezer. The fridge compartment warmed up whilst the freezer compartment continued to keep temperature.
The cause of our problem was diagnosed as a frozen sensor that controls a flap, that controls the flow of cold air from the freezer compartment up into the fridge compartment. We were advised to power off the fridge freezer (removing all food and trays from the freezer unit first), and to leave it to defrost for 24hrs. We needed to place a few towels on the floor of the freezer compartment to soak up the melt water. After 24hrs we followed the power up instructions in the manual (versions are available online if you have lost yours). Within a few minutes it was obvious that the fridge compartment was being cooled – Problem solved :)
kinnsj@hotmail.com, November 2008