Have Sub Zero model 532, SN M68837, frost and ice build up on left side of back wall in frig., just above drawers. Frig seems to cool just fine. Compressor and evaporator replaced in 2001.
Removed back panel and discovered ice buildup - see attached photos. Allowed frig to defrost and have restarted to see if ice comes back.
Need help identifying the cause and procedures & parts for repair.
Thank you.
before defrosting.JPG (70.5 KB)
After Defrosting.jpg (36.8 KB)
