Gone from Bosch’s catalog, the B36BT830NS was a 36-inch Benchmark built-in with the freezer at the bottom and a stainless door, 35 3/4 inches wide and 83 3/4 tall. On top of the freezer sat a fresh food section whose two doors meet in the middle, plus an ice maker and filtered water.
The center strip, called a mullion, deserves attention. Many designs fit it with a heater so condensation does not collect where the two seals touch. If that heater fails, the strip stays damp or grows frost, and what the owner sees is a wet stripe, with no sign at all of a temperature problem. It is not dangerous, but left alone, moisture works into the seals and eventually the edge of the cabinet.
A permanently wet strip therefore sends us to the heater and its control. Next we check the gaskets, which stiffen after years in a warm kitchen, and the freezer drawer runners, which bind under load. The repair is contained, and we write the price down before starting.
Many layouts like this one fit the strip with a small heater that stops condensation forming there. If the strip turns wet or frosty, that heater or its control has usually stopped working, and the repair is contained.
It is not dangerous, but it is worth fixing soon. Moisture there works its way into the door seals and eventually the cabinet edge if it is left alone for long.
Not directly. The compartments hold their temperature; the issue is moisture and frost along the center line, which is why owners notice it before anything else.
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