Common fault
Why is my Sub-Zero refrigerator not cooling?
Short answer
If the freezer is still hard frozen and only the refrigerator has climbed, the compressor is not your problem. These units run two independent sealed systems, so a working freezer proves the expensive half is healthy.
Why we start there
What is left is air, and inland that list starts at the condenser: a grille packed with grove dust and driveway grit cannot reject heat, so the unit holds temperature on a cool morning and loses it through the afternoon. After that come the refrigerator section's own evaporator fan and a defrost fault that has iced its coil into an insulator.
What happens next
The tell we listen for is timing. A fault that is worse in the afternoon and better by morning is nearly always airflow or condenser, because the unit is losing a race with ambient temperature and then winning it back overnight. A fault that is constant, in a fridge that never recovers at all, points instead at the evaporator fan or a defrost circuit that has stopped running entirely. Which of those you describe on the phone decides what goes on the van.
Two things are worth checking before you call and neither costs anything. Look at the freezer first, because a warm freezer alongside a warm fridge is a different diagnosis than a warm fridge on its own. Then look at the grille, top or bottom depending on the model, and see whether you can see daylight through it. If it is a felt mat of dust you have already found part of the answer.
If that matches what yours is doing, say so when you call — it decides which parts come on the van.
Reviews
I had the old 600 series written off and was pricing replacements. He said the sealed system was healthy and it came down to an evaporator fan and a gasket that had stopped pulling. The kitchen was built around that cabinet, so that mattered.
- ★★★★★
Our Sub-Zero freezer stopped working overnight. We called and had a technician at our Fallbrook home within hours. The repair was fast and professional—saved our entire freezer contents!" - Jennifer M., Fallbrook
- ★★★★★
Excellent service in Valley Center. The technician quickly diagnosed a sealed system issue in our built-in refrigerator and provided a clear, reasonable estimate. Highly recommended." - David L., Valley Center
Appliance down in North County San Diego?
Tell us the brand and what it is doing — we can usually name the likely repair before we arrive.
Questions
Frequently asked questions
Our water comes from a well. Does that change how you approach an ice maker?
It changes the order of the checks. These ice makers were engineered around clean municipal supply at steady pressure, and a well gives neither. Sediment silts the inlet valve screen, mineral scales the fill tube and mold until cubes stop releasing, and pressure sags between pump cycles and short-fills a mold that filled perfectly that morning. The water gets measured before anybody quotes a module.
We were without power for a couple of days. What is worth checking before I call?
Start at the breaker and confirm the unit woke up rather than sitting on a latched alarm. Look at the freezer floor for a sheet of ice, because meltwater that refroze on its way down the drain is the usual souvenir of an outage out here. Check whether the ice maker restarted, and whether the compartments came back to temperature or only the display did.