My subzero 550 ice maker is not making ice - Sub-Zero Bottom Freezer Refrigerator

could be copper tubing oxidizing

If the noise is coming from the ice maker head itself. Then it sounds like the gear is slipping. They are plastic and it is very common for them to crack or break. Most ice makers are the same. Click Here to see a post on a Whirlpool ice maker with a broken gear.

Good Luck From David at refrigerator repair.

water filter clogged, fill solonoid clgged, or inline screen clogged, check all that applies

This is either the defrost sensor or the main board. Neither of which you can do anything about with no parts. https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Refrigerator/55-114-539299-/Sub-Zero-Refrigerator-not-defrosting-642

make sure your ice tray in in the righ position. really important. the tray have to press the ice maker switch. or bad ice maker or bad water valve. also make sure to press the ice maker key. in the display. ONLY IN NEW MODELS

Good day,
No, a new water valve should solve that problem. The diaphram in the valve is not completely closing.
Very common problem.

Thank you for using FixYa

buy the water valve and the ice maker. replace. water valve locate in the bottom part of the unit. remove kickplate. (left side blue color). ice maker little trick to replaced. (special the 2 screws in the upper part.) call 1800 222 7820. subzero. for your closest store

Called repair service that seller recommends.

defrost problem ... do you have frost or ice?

Our 550 bottom freezer drawer froze shut earlier this week and the motor made an unusual sound, like it was working too hard. Two of us eventually were able to open the drawer to find that it had frozen shut due to a leak which filled the ice tray solid and then adhered to the actual door, freezing it shut. We emptied the fridge and freezer, turned the control dials down to 0, but neither the motor nor the light would go off. We finally killed the circuit breaker to get the appliance to shut down. It's cleaned and defrosted and we noticed that the gasket has torn in three places, two on the fridge door and one on the freezer door. The freezer door could be from our tugging, but the refrigerator door is normal wear and tear. We filled the tears with some kind of putty and when it is dry we will start everything up again. This is not the first problem of this nature we have experienced with our subzero 550, but it is the most dramatic. Each previous time we have called a repair man out and he has been unable to fix it.