A Sub-Zero refrigerator that freezes food usually has a set point that's too low, food placed against the cold air outlet, a failed or drifting fresh food thermistor, a damper or refrigerant valve stuck open, or a control board fault.
Frozen lettuce and slushy milk mean the fresh food section is getting more cooling than it should.
Check These First (5 Minutes, No Tools)
- Check the set point. 38°F is typical.
- Make sure Max Cool or a similar boost mode isn't active.
- Move produce and drinks away from the rear air outlet.
- Use a thermometer in a glass of water on the middle shelf to verify the actual temperature.
Most Common Causes
| Cause | What happens | Fix |
|---|---|---|
| Thermistor | Sensor reads warmer than reality, so the control overcools. | Pro |
| Damper / valve stuck | Cold air or refrigerant keeps flowing to the fresh food side. | Pro |
| Control board | Output stuck on. | Pro |
| Placement | Items against the outlet freeze even when the average temperature is correct. | DIY |
How We Fix It
We compare actual temperatures with sensor readings, test the damper or valve and check control outputs.
When to Call a Technician
If the basic checks above don't solve it within a few hours, or if you hear repeated clicking, see an alarm or service indicator, or notice water under cabinetry, call us at (725) 237-7399. The $75 service call is credited toward your repair, repairs carry a 1-year parts and 180-day labor warranty, and we stock the Sub-Zero parts behind most of these failures.
Still Not Working? We Can Help Today.
$75 service call, credited toward your repair · 1-year parts · 180-day labor warranty · EPA 608 certified · Mon–Fri 8am–7pm · Sat–Sun 8am–4pm