Stainless French-door refrigerator in a white kitchen next to a range
8 components covered

Field manual · Refrigerator

Bosch Benchmark B36BT935NS 36-inch built-in bottom-freezer refrigerator: quick sheet

Covers: Bosch Benchmark 36-inch built-in (84 in. tall) bottom-freezer refrigerator B36BT935NS in its production variants (Bosch support lists FD/version suffixes such as /01, /04, /05, /06, /14, /17, /18, /20). Bosch lists the model as no longer available, so parts and the variant suffix matter. Benchmark column refrigerators and the counter-depth freestanding Bosch French-door models are different platforms. Read the rating label inside the fresh-food compartment for model, FD number and serial.

Single sourceBrands: Bosch8 components

A stainless built-in (not panel-ready) bottom-freezer with separate compressors for the refrigerator and freezer, so a warm fresh-food side with a cold freezer is a separate system problem, not an airflow damper problem. It runs on a 120 V, 15 A supply, has an automatic ice maker (Bosch lists about 2.9 lb per 24 h and 7 lb storage), an UltraClarityPro water filter, a door alarm, Sabbath mode and Home Connect Wi-Fi. Bosch's public guidance on displayed 'E' codes is generic (electronics detected a fault: power off, wait, power on, call service if it returns); third-party code lists for Bosch refrigerators disagree on numbering, so treat any code as a pointer and test the part.

Safety first

  • Unplug or turn off the breaker before removing panels; the machine compartment has 120 V and fans that start automatically.
  • Sealed-system work (compressors, leaks, recharge) is blocked here: refer to an EPA 608-certified technician; confirm the refrigerant on the rating label first.
  • Built-in units are anchored and heavy: do not pull from the opening without the installation guide and a helper.

How it works

Two sealed systems: Bosch lists dual compressors for fridge and freezer, and the spec sheet lists dual evaporators. Each compartment has its own evaporator and fan, and the control runs each system to its own sensor. A single warm compartment points at that compartment's fan, defrost or sensor, or at that system's compressor.

Condenser cooling: built-in units of this type breathe through the front toe grille, with the machine compartment low in the cabinet (confirm the layout for the FD version in the installation guide), and a condenser fan moving air across the condenser. Blocked or dusty grilles raise run time and can make one or both compartments warm.

Defrost: each evaporator is defrosted by a heater; a defrost failure frosts the coil, the fan blade starts to tick on ice and airflow drops. Repair-site reports name iced evaporators and evaporator fan failures as the common warm-compartment causes on Bosch refrigerators.

Electronics: the control reads compartment sensors and shows temperatures and alarms on the display. A temperature alarm (beeping, warning symbol) is not necessarily a fault code; an 'E' code means the electronics detected a fault (Bosch France guidance). Third-party sites assign E1/E2/E01/E02 to specific sensors but disagree.

Ice and water: a water valve feeds the dispenser and ice maker through the filter; BSH troubleshooting (Thermador's refrigeration page) lists filter seating, a closed shut-off valve and kinked lines as the first checks for low water flow.

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Stainless French-door refrigerator in a white kitchen next to a range by Curtis Adams, Pexels License

Diagnostic guides for this appliance

Guide · Refrigerator

Adaptive defrost control (ADC) board: how to diagnose it

An adaptive defrost board replaces the old cam timer. It counts compressor run time (and on some boards door-open time) and adjusts the next defrost interval based on how long the last one took. Test the heater and the cold bimetal first, then force a defrost: if the heater warms on a forced defrost but the coil still ices, the board isn't starting defrost on its own.

8 steps ~60 minmoderate
Guide · Refrigerator

Ice dispenser not dispensing ice (ice maker is making ice)

Most cases are mechanical: cubes fused into a block, a bin not fully seated on the auger drive, or ice behind the auger motor. After that, check the electrical path: door switch, dispenser switch, auger motor voltage and, on crushed/cubed models, the cube solenoid. Water dispensing working is a useful clue that the dispenser control has power.

8 steps ~45 minmoderate
Guide · Refrigerator

Refrigerator runs all the time

First decide if it's really a problem. Whirlpool says 40-80% run time is normal at average room temperature, and newer variable-speed compressors are designed to run long at low speed. If it's truly excessive, the usual causes are heat-rejection problems (dirty condenser, dead condenser fan), air leaks (gaskets, doors) and a frosted evaporator. A compressor or refrigerant fault is a referral.

8 steps ~45 mineasy

Other refrigerators manuals

Manual · Refrigerator

Whirlpool / Maytag / Amana top-freezer refrigerator (WRT series): field service manual

Whirlpool-built top-mount refrigerators sold under the WRT and similar series and their sister badges: older units with a mechanical defrost timer, and later units with an adaptive defrost control (ADC) board. Dial or slider controls, single evaporator in the freezer.

9 components6 common failuresWhirlpool, Maytag, Amana, Roper
Manual · Refrigerator

GE / Hotpoint top-freezer refrigerator (GTS, GTE, GIE series): field service manual

GE-built top-mount refrigerators in the GTS, GTE and similar series and Hotpoint equivalents: older units with a mechanical defrost timer, later units with an electronic defrost control board. Two-dial controls (freezer and fresh food) or a single cold-to-coldest dial.

8 components5 common failuresGE, Hotpoint
Manual · Refrigerator

Frigidaire top-freezer refrigerator (FFTR, FFHT, LFTR series): field service manual

Frigidaire-built top-mount refrigerators in the FFTR, FFHT and similar series, with a mechanical cold control and air-damper control, or slider/electronic controls on some models. Single evaporator in the freezer. Mechanical timer on older units; adaptive defrost control on many later ones.

7 components5 common failuresFrigidaire, Electrolux-built
Bosch Benchmark B36BT935NS 36-inch built-in bottom-freezer refrigerator: quick sheet · OnCall Tech