Moving to the 800 tier, as in the B36CD80SNS, buys precision rather than capacity. The cabinet is the familiar 70 inch counter-depth French door body; the difference is VitaFresh Pro drawers: each keeps its own temperature and humidity, independent of the main compartment, and a smarter control system manages them.
Independence has a side effect. Every one of those drawers carries its own sensors and small dampers, which means one can fail alone while everything else in the cabinet works as it should. An owner then sees vegetables freezing in a single drawer and assumes the whole cooling system has failed, when it is a small assembly that can be replaced alone.
We begin with the drawer in question: its sensor, its damper and the humidity seal that stops the setting holding. After that we listen to the condenser fan, because the shallow, enclosed machine compartment makes fan noise climb. An 800 Series needs no more frequent servicing than a 300, only more zones to adjust.
Every VitaFresh drawer has a separate sensor and damper. When just one runs cold, the culprit is that small assembly and not the main cooling system.
No. The difference is the number of separately controlled zones. Each can be adjusted or replaced on its own, and that usually keeps one problem from spreading.
The machine compartment on a counter-depth cabinet is shallow and enclosed, so condenser fan noise grows as bearings age or lint builds up. We clean it and test the fan.
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