Sub-Zero warm but freezer OK — likely causes

1. Evaporator fan. Freezer cold but fridge warm = fan not moving air.
2. Iced evaporator. Frost behind fridge panel → defrost issue; needs service.
3. Air damper. Stuck closed; listen for change when opening/closing.
4. Sealed system. Only part of coil frosts, runs nonstop → pro diagnostics.

I work on Sub-Zero/Thermador/Viking sealed systems with 1-year warranty on repairs. Call for an estimate.