Sub-Zero warm fridge & split temperature in Sunnyvale

On dual-refrigeration models this almost always traces to airflow rather than cooling power: a stuck air damper, a tired evaporator fan, a defrost fault icing the coil, or a sensor reporting the wrong temperature. The freezer system is still making cold, but that cold is not reaching the fresh-food side. We confirm which part on-site, then repair it with genuine OEM parts.

Rarely, when only one side is warm. Because Sub-Zero uses two separate cooling circuits, a single warm compartment points to a damper, evaporator fan, defrost or sensor problem instead. A compressor or sealed-system fault usually shows up as both sides losing cold together. We verify the real cause before quoting, so you are not paying for a part you do not need.

Most split-temperature jobs run $240 to $900, depending on whether the fix is a damper, sensor, evaporator fan, defrost heater or door gasket. The $89 service call is waived when you book the repair, and all labor carries a 365-day warranty. See full pricing for the breakdown; your final quote depends on the model and on-site diagnosis.

Recurring frost usually means the defrost circuit or door seal is not doing its job. We test the defrost heater and sensor, clear the condensate drain, and inspect the gasket for gaps that let humid room air in. Treating only the surface frost lets it return within days, so we fix the underlying heater, sensor, drain or seal that caused it.

Often yes. Split-temperature faults are frequently a same-visit repair once we diagnose the damper, fan, defrost or sensor, since these parts are common to most built-in models. We hold same-day and next-day windows across Sunnyvale plus Mountain View, Cupertino, Santa Clara and Los Altos. Call (669) 338-4601 early for the best same-day chance.

When both compartments lose cold together, the cause is more likely the control board or sealed system than airflow. That is a different diagnostic path, so start with our Sub-Zero not cooling page. Either way, we measure compartment temperatures, airflow and sensor readings on-site using factory-spec diagnostics before recommending any part, so the repair targets the actual failure.

No. We are an independent Sub-Zero repair company, and not affiliated with the manufacturer. That said, we install genuine OEM Sub-Zero parts, follow manufacturer-recommended procedures and factory-spec diagnostics on dual-refrigeration units, and back every repair with a 365-day labor warranty. Sunnyvale homeowners rate us 4.9 across 1071 reviews, so you get expert built-in service without the dealer wait.