Depending on the age of your fridge, your insulation inside your wall may be saged with water. Thi water will freeze causing the ice to radiate through your cromadeck wall.
sap
February 2016
Modern fridges have an auto defrost feature to stop this happening - yours is clearly defective.
Your options are:
Live with it and do nothing
Defrost manually
Send for a fridge doctor
Buy a new fridge
Do not be tempted to chip away at the ice block - you can very easily puncture the cooling pipes.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix refrigerators.