Common fault
Why is my Sub-Zero refrigerator not cooling?
Short answer
Check the freezer before you do anything else.
Why we start there
If it is still hard-frozen while the refrigerator section has gone warm, a Sub-Zero built-in has already ruled out the expensive answer for you: the two compartments run on separate sealed systems, and one of them is plainly working. The fault sits on the refrigerator circuit, and it is almost always the evaporator fan that has stopped turning, a defrost failure that has iced that coil into a solid block, or the defrost heater and thermistor that should be clearing it. Those are ordinary parts and ordinarily one visit.
What happens next
The reason we ask where in La Jolla you live before we load the van is that the same symptom has a different favorite cause on either side of town. On the ocean-facing streets, from Windansea and Bird Rock through Lower Hermosa and down to the Shores, the condenser has been breathing salt air for years. Salt deposit on aluminum fins is an insulator, so the coil stops rejecting heat properly, the compressor runs longer to compensate, and the first compartment to suffer is the refrigerator because it has the smaller temperature margin. Up through the Muirlands, Hidden Valley, Country Club and toward Mount Soledad, we are more often looking at a warmer room, a restricted grille and a control that has been cycling hard for a decade.
The sequence on the visit does not change. We pull the lower grille and look at the condenser and its fan first, because that is both the cheapest thing to fix and the most common thing to be wrong. Then the refrigerator evaporator: fan turning or not, coil clear or iced. If it is iced, we force a defrost and watch whether the heater actually draws current and whether the ice clears, which separates a dead heater from a thermistor that has drifted out of range. Then the door gasket, checked with a measurement rather than a look, because a heavy custom panel that has pulled a door out of square produces a permanently warm refrigerator that no amount of new parts will fix.
If that matches what yours is doing, say so when you call — it decides which parts come on the van.
Reviews
The glass on our wine cabinet fogged every gray morning and I was sure it was running too cold. It wasn't. The heater in the door had failed and the seal had gone soft at the bottom. He read the temperature at the rack, not off the panel, and left my setting alone.
- ★★★★★
The ice machine in the terrace bar had been getting slower all summer and we blamed the parties. He pulled the grille and the coil was corroded and matted. Cleaned it, checked the water side and the filter, full cubes again. Said to have it looked at before summer next time.
- ★★★★★
Frost kept coming back on the freezer wall a week after I cleared it. Two other companies had been out and both wanted to fit a defrost heater. He measured the door instead and the heavy panel had dragged it out of square at the bottom. Hinge adjusted, no frost since.
Appliance down in La Jolla?
Tell us the brand and what it is doing — we can usually name the likely repair before we arrive.