Why is my Sub-Zero refrigerator not cooling?

The order we work through and the reason for it. Condenser and grille first, since a fin pack you cannot see light through has stopped doing its job whatever it looks like from the front, and on Point Loma it is the single likeliest answer on either side of the ridge. Second, the fresh-food fan: hold the door switch in with the door open and you can usually hear whether it is turning. Third, defrost, which gives itself away as a solid slab of ice over the freezer coil. Then the damper, then the seals, then the board. The list runs from cheap and common toward expensive and rare, which also happens to be the order in which these faults genuinely occur.

Two things worth checking before we get there. Look at whether a custom cabinet panel or a closed-off toe kick is lapping the lower grille, which is common around Loma Portal and the Wooded Area where a modern built-in went into a kitchen framed long before it existed. And hold a hand near that grille while the unit runs. Air should be moving and it should feel warm. Still, cold air there while the cabinet is warm usually means the unit is not actually running at all, which is a different and normally much simpler conversation about power and controls.

If that matches what your appliance is doing, say so when you call — it tells us which parts to bring, and most of these are finished in one visit.