Sub Zero Ice Machine Cubes are Shallow, Incomplete or White – How to fix? by ApplianceRepairLosAngeles.net  

How to Use the Troubleshooting Guide 3 The list below indicates how the Troubleshooting Guide is arranged. Identify the description of the problem that the unit is experiencing from the list and go to the page indicated. To the left of the problem description is a letter. Locate that letter in the left column of the Troubleshooting Guide. The center column will identify the possible causes for the problem. And, the information in the right column will explain what tests to perform in order to determine if what you are checking is the cause and/or what action to take to correct the problem.

Problem Posible Cause TEST / ACTION
Cubes are Shallow, Incomplete or White Dirty Ice Making System a. Unit needs cleaning. See Maintenance, Cleaning and Adjustment Information section of service manual. b. Have water quality tested; qualified company could make appropriate filter recommendations. c. Have water softener inspected, repaired (if applicable).
Not Enough Water in Water Trough a. Check water supply line for kinks or restrictions. Replace defective supply line. b. Check water filter (partially clogged). Replace filter. c. Check screens in water valve for obstructions. Clean screens or replace valve. d. Check for loose wiring to water valve. Repair bad connections. e. Check trough for leak. Reposition/replace trough. f. Check standpipe. Reposition or replace.
Freeze Time Too Short See Cube Weight Check and Adjustment in Maintenance, Cleaning and Adjustment Information section of service manual.