Why is my Sub-Zero fridge warm but the freezer cold?
The fresh food side has its own controls, so the control board, the door gasket or a hinge is the usual cause.

HomeRefrigerator
The fresh food side of every Sub-Zero configuration and series.
Mon to Sun, 7am to 9pm
Quick summary
Sub-Zero refrigerator repair for the fresh food side of columns, French door, side-by-side and over-and-under units: error codes, a reset that will not hold, the control board, a door gasket or hinge that leaves the door not sealing, and the interior light, on Classic series BI-42 and BI-48, Pro 48, Designer series, 500 and 600 series and older models.
An error code on the panel, or a reset button that clears it for a day, sends the search to the control board. It is tested in place before it is replaced. This is part of our Sub-Zero repair in Manhattan.

Sub-Zero dual refrigeration gives the fresh food section its own cooling and its own controls, so a fridge warm beside a freezer cold points to that side: the control board, the door gasket or a door hinge. Colder side faults are on freezer repair.
A torn door gasket or a dropped hinge leaves the door not sealing. On a panel-ready door the custom panel is refitted too, so door and drawer alignment is true again.

The fresh food side has its own controls, so the control board, the door gasket or a hinge is the usual cause.
A breaker reset can clear a code once. If it returns, the control board needs a technician.
Yes, including 500 and 600 series units.