Bosch B20CS51SNS/02 refrigerator Parts

To reset your Bosch refrigerator model B20CS51SNS, we recommend doing a hard reset: unplug the refrigerator (or switch the breaker off) for about 5 minutes, then restore power and allow 24 hours for temperatures to fully stabilize.

Hard reset steps (recommended)

• Unplug the refrigerator from the wall outlet; if you cannot access the plug, turn the circuit breaker off.
• Wait 5 minutes (this lets the control board fully power down).
• Restore power.
• Set the controls back to your normal settings.
• Listen for fans and the compressor to restart; normal cycling can take a few minutes.
• Give the unit 24 hours to return to target temperatures.

If you are resetting because of a symptom

A reset can clear a temporary control glitch, but it will not fix a failed sensor, fan, or water-flow issue. Use this quick guide to decide what to check next.

What you notice	What it usually points to	What to do next
Display acting odd or buttons not responding	Control glitch	Hard reset, then recheck operation
Warm freezer or fridge section	Cooling/airflow issue	Check vents, door closure, and fan noise
Error code showing	Detected fault	Use Bosch side by side refrigerator error codes to identify the code
Water tastes/flows poorly after reset	Filter restriction or air in line	Replace filter and purge air from dispenser

Parts that commonly relate to “reset” complaints

If the refrigerator keeps acting up after a reset, these model-matched parts are often involved in temperature sensing or cooling performance:

• Refrigerator freezer evaporator sensor 00601059
• Refrigerator condenser fan motor 00601016
• Refrigerator water filter 00640565

Why it matters

Resetting safely clears minor electronic glitches and restores normal control logic. If the problem returns quickly, it usually means the refrigerator is detecting an ongoing issue (temperature sensing, airflow, or water filtration) that needs troubleshooting or a part replacement.

Last updated: February 2026

Bosch refrigerators, including the Bosch B20CS51SNS side-by-side, are generally a good choice for long-term reliability and consistent temperature control. With normal use and basic upkeep, most refrigerators in this class typically last about 14 to 19 years, making Bosch a solid, dependable brand.

What “good” looks like in day-to-day use

A refrigerator is doing its job when it holds steady temperatures, runs quietly most of the time, and avoids frequent ice or water issues.

• Fresh food stays near 37°F and freezer near 0°F
• Doors seal tightly with no warm air leaks
• Ice maker and dispenser flow stays consistent
• Compressor cycles on and off normally (not constantly running)
• No recurring error codes or repeated warm-ups

Common issues that can make any fridge seem “bad”

Many complaints come from a few fixable areas, especially on side-by-side models.

Symptom	Common cause	What to check first
Freezer OK, fridge warm	Airflow restriction or fan issue	Vents blocked by food; frost buildup
Warm temps both sides	Dirty condenser area or fan problem	Condenser fan running; coils clean
Water tastes off or slow flow	Filter restriction or air in line	Replace filter; purge air
Door not closing smoothly	Hinge/bearing wear or leveling	Door alignment; bearing condition

If you are seeing fault codes, use our Bosch side by side refrigerator error codes guide to narrow the problem quickly.

Parts that often restore performance

When cooling, water, or door operation is off, these model-matched parts are common fixes for the B20CS51SNS:

• Refrigerator water filter 00640565 for taste, odor, and flow issues
• Refrigerator condenser fan motor 00601016 if the unit runs hot or struggles to cool
• Refrigerator door bearing 00600989 if the door sags, binds, or won’t close cleanly

Why it matters

A “good” refrigerator protects food safety and reduces energy waste. Small problems like a restricted water filter, weak airflow, or a dragging door can make the refrigerator run longer, warm up, and feel unreliable.

You can order replacement parts for your Bosch B20CS51SNS from the parts list for this model, or search by model number on Sears PartsDirect.

Last updated: February 2026

On the Bosch B20CS51SNS, an E2 code commonly points to a temperature-sensing or cooling-feedback problem that can affect freezer performance and, in many cases, ice production. We treat it as a “check cooling and sensors” alert and troubleshoot from airflow, frost, and sensor readings.

What to check first (fast, no parts)

• Confirm the freezer is actually cold (target is typically 0°F).
• Make sure vents are not blocked by food packages.
• Listen for the evaporator fan running when the door switch is pressed.
• Look for heavy frost on the freezer back wall (a defrost issue can trigger sensor-related errors).
• Power reset: unplug for 5 minutes, then restore power and recheck.

Likely causes and the most relevant parts

E2 is often tied to the refrigerator not “seeing” the right temperature change.

What you notice	Most likely area	What we usually test/inspect	Parts that may apply
Warm freezer, weak airflow	Evaporator fan or airflow restriction	Fan operation, ice buildup, vent blockage	(Fan not listed in the parts shown)
Frosted-over freezer panel	Defrost system or airflow	Frost pattern, door seal, drain/ice blockage	(Defrost parts not listed in the parts shown)
Temps swing, error returns	Temperature sensor circuit	Sensor resistance/connection, harness seating	Refrigerator freezer evaporator sensor 00601059

If ice maker stopped too

Even when the display shows E2, the symptom you feel is often “no ice” because the freezer is not staying cold enough.

• Verify freezer temp is at or near 0°F.
• Dump old/clumped ice and make sure the bin seats fully.
• If the dispenser water flow is weak, replace the filter and purge air.

For filter-related steps, use our DIY guide: how to replace the water filter in a Bosch refrigerator. If you need the correct filter for this model, use refrigerator water filter 00640565.

Why it matters

E2 is important because temperature-sensing errors can hide a real cooling problem. Catching airflow restrictions, frost buildup, or a failing sensor early helps prevent food thawing and repeat ice maker shutdowns.

For additional Bosch-specific code details and what to check next, use: Bosch side by side refrigerator error codes.

You can order replacement parts for your Bosch B20CS51SNS from the parts list for this model, or search by model number on Sears PartsDirect.

Last updated: February 2026