The BI-42S is one of Sub-Zero’s classic 42″ side-by-side built-ins, a 16.3 cu. ft. dual-compressor cabinet that’s been out of production for years — most of these units in service today are well into their second decade. Because the fresh-food and freezer sides run on separate compressors, a problem on one side rarely means the other side is also affected.
Two specific codes are common on this model: a 40/1/40 for excessive compressor runtime, which usually traces back to an aging door seal rather than the compressor itself, and a 10/R/01 pointing to a shorted evaporator thermistor. After this many years of daily use, door seal compression loss alone accounts for a good share of the runtime problems we see on a BI-42S.
Key Features
- 42" side-by-side built-in refrigerator/freezer
- 16.3 cu. ft. capacity
- Dual-compressor cooling
- Panel-ready or stainless finish
Most Common Issues on This Model
40/1/40 excessive compressor runtime, often from an aging door seal
10/R/01 evaporator thermistor shorted
Door seal compression loss after years of daily use