Error Codes
How do I reset my Bosch refrigerator?
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.
- 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.
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 |
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
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
Is a Bosch refrigerator good or bad?
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.
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
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.
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
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
What does E2 mean on my Bosch refrigerator?
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.
- 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.
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 |
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.
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
