The short answer
Noise on the B family is rarely urgent and occasionally important. Buzzing and gurgling are the appliance working; rattling is usually something touching something; a grinding or scraping that tracks a fan is the one that needs attention. Sorting yours into one of those groups takes a minute and no tools.
What you observe on these models
- A grinding or scraping that tracks a fan — The noise worth acting on: something is touching a moving part.
- Gurgling or trickling after the compressor stops — Refrigerant settling, and entirely normal on every design.
- A loud crack from the freezer — Ice releasing or plastic contracting with temperature. Startling and harmless.
- Vibration through the floor rather than noise in the room — Levelling and the floor itself, not a component.
- NEAR MISS - a hum with no cooling at all — A compressor trying to start and failing sounds like a hum; that belongs on the cooling page.
Causes, most likely first on the B family
- Levelling and the floor — First on the models below. A cabinet with one foot barely bearing weight transmits every vibration into the floor, and what the owner hears is not where the noise is made.
- Fan blades against ice or a frost build-up — Second, and the noise most worth acting on, because ice against a fan is a sign of a defrost problem as well as a source of sound.
- Loose or vibrating items: trays, shelves, bottles — Third, and the cause of most rattles. Free to find by touching things while the noise is happening.
- Machinery: fans, compressor, sealed system — Last. Real mechanical noise is uncommon and is a service call; most of what is blamed on the compressor is one of the three above.
Check in this order, and why
- First: decide whether the noise is new — Refrigerators have always ticked and gurgled. What matters on the models below is whether this sound arrived, and when.
- Second: time it against the cycle — Noise only when the compressor runs, only during defrost, or continuously. Each points somewhere different.
- Third: look for ice near the freezer fan — A blade catching frost is the noise most worth finding, because it means a defrost problem as well.
- Fourth: clear the surroundings and re-listen — Pull the cabinet clear of the wall, clean the condenser area, seat the drip tray, and listen again before calling anyone.
Before you open anything
Safety
Unplug the refrigerator or switch off its breaker before removing any interior panel or reaching towards a fan; a capacitor can hold a charge after the power is off. Never put a hand near a running fan to find a noise, and never chip at ice around a fan blade with a metal tool - piercing the evaporator turns a noise complaint into a sealed-system repair.
Models in the B family
Reference| Model number | Family key |
|---|---|
| B09IB80NSP | bosch:refrigerator:b |
| B09IB81NSP | bosch:refrigerator:b |
| B09IB91NS* | bosch:refrigerator:b |
| B10CB80NV* | bosch:refrigerator:b |
| B10CB81NV* | bosch:refrigerator:b |
| B11CB50SSS | bosch:refrigerator:b |
| B11CB81SSS | bosch:refrigerator:b |
| B18ID80*** | bosch:refrigerator:b |
| B18IF800SP | bosch:refrigerator:b |
| B18IF900SP | bosch:refrigerator:b |
| B18IF905SP | bosch:refrigerator:b |
| B20CS30SNS | bosch:refrigerator:b |
| B20CS50SNB | bosch:refrigerator:b |
| B20CS50SNI | bosch:refrigerator:b |
| B20CS50SNS | bosch:refrigerator:b |
| B20CS50SNW | bosch:refrigerator:b |
| B20CS51SNB | bosch:refrigerator:b |
| B20CS51SNI | bosch:refrigerator:b |
| B20CS51SNS | bosch:refrigerator:b |
| B20CS51SNW | bosch:refrigerator:b |
| B20CS80SNB | bosch:refrigerator:b |
| B20CS80SNS | bosch:refrigerator:b |
| B20CS80SNW | bosch:refrigerator:b |
| B20CS81SNB | bosch:refrigerator:b |
| B20CS81SNS | bosch:refrigerator:b |
| B20CS81SNW | bosch:refrigerator:b |
| B21CL80SNS | bosch:refrigerator:b |
| B21CL81SNS | bosch:refrigerator:b |
| B21CT80*** | bosch:refrigerator:b |
| B21CT80SNS | bosch:refrigerator:b |
| B22CS30SNS | bosch:refrigerator:b |
| B22CS50SNS | bosch:refrigerator:b |
| B22CS50SNW | bosch:refrigerator:b |
| B22CS51SNS | bosch:refrigerator:b |
| B22CS80SNS | bosch:refrigerator:b |
| B22CS81SNS | bosch:refrigerator:b |
| B22CT80SN* | bosch:refrigerator:b |
| B22FT80SNS* | bosch:refrigerator:b |
| B24CB50ES* | bosch:refrigerator:b |
| B24CB50ESS | bosch:refrigerator:b |
| B24CB80ES* | bosch:refrigerator:b |
| B24CB80ESS | bosch:refrigerator:b |
| B24ID80*** | bosch:refrigerator:b |
| B24IF70*** | bosch:refrigerator:b |
| B26FT**SN* | bosch:refrigerator:b |
| B26FT50SNS | bosch:refrigerator:b |
| B26FT70SNS | bosch:refrigerator:b |
| B26FT80SNS | bosch:refrigerator:b |
| B26FT81SNS | bosch:refrigerator:b |
| B30BB130S* | bosch:refrigerator:b |
| B30BB130SS | bosch:refrigerator:b |
| B30BB830** | bosch:refrigerator:b |
| B30BB830SS | bosch:refrigerator:b |
| B30BB930SS | bosch:refrigerator:b |
| B30BB935SP | bosch:refrigerator:b |
| B30BB935SS | bosch:refrigerator:b |
| B30IB100S* | bosch:refrigerator:b |
| B30IB100SP | bosch:refrigerator:b |
| B30IB800SP | bosch:refrigerator:b |
| B30IB900SP | bosch:refrigerator:b |
| B30IB905SP | bosch:refrigerator:b |
| B30IB910SP | bosch:refrigerator:b |
| B30IR800SP | bosch:refrigerator:b |
| B30IR900SP | bosch:refrigerator:b |
| B30IR905SP | bosch:refrigerator:b |
| B33CM10SNS | bosch:refrigerator:b |
| B36BT130N* | bosch:refrigerator:b |
| B36BT130NS | bosch:refrigerator:b |
| B36BT830NS | bosch:refrigerator:b |
| B36BT930NS | bosch:refrigerator:b |
| B36BT935NS | bosch:refrigerator:b |
| B36CD10EN* | bosch:refrigerator:b |
| B36CD30EN* | bosch:refrigerator:b |
| B36CD50SN* | bosch:refrigerator:b |
| B36CD51SN* | bosch:refrigerator:b |
| B36CD52SN* | bosch:refrigerator:b |
| B36CD80EN* | bosch:refrigerator:b |
| B36CD80SN* | bosch:refrigerator:b |
| B36CL80*NS | bosch:refrigerator:b |
| B36CL80EN* | bosch:refrigerator:b |
| B36CL80SN* | bosch:refrigerator:b |
| B36CL81EN* | bosch:refrigerator:b |
| B36CL84ENG | bosch:refrigerator:b |
| B36CL84ENS | bosch:refrigerator:b |
| B36CL84ENW | bosch:refrigerator:b |
| B36CL84SN* | bosch:refrigerator:b |
| B36CT80SN* | bosch:refrigerator:b |
| B36CT81EN* | bosch:refrigerator:b |
| B36CT81SN* | bosch:refrigerator:b |
| B36CT82EN* | bosch:refrigerator:b |
| B36CT82SN* | bosch:refrigerator:b |
| B36CT84EN* | bosch:refrigerator:b |
| B36CT84SN* | bosch:refrigerator:b |
| B36ET71S** | bosch:refrigerator:b |
| B36FD10EN* | bosch:refrigerator:b |
| B36FD30EN* | bosch:refrigerator:b |
| B36FD31EN* | bosch:refrigerator:b |
| B36FD50SN* | bosch:refrigerator:b |
| B36FD51SN* | bosch:refrigerator:b |
| B36FD52SN* | bosch:refrigerator:b |
| B36FD54SN* | bosch:refrigerator:b |
| B36IT100N* | bosch:refrigerator:b |
| B36IT100NP | bosch:refrigerator:b |
| B36IT71*** | bosch:refrigerator:b |
| B36IT800NP | bosch:refrigerator:b |
| B36IT900NP | bosch:refrigerator:b |
| B36IT905NP | bosch:refrigerator:b |
| B36IT930NP | bosch:refrigerator:b |
When to call a technician
The owner side on the models below is everything you can touch: levelling, clearance, shelves, the drip tray and the dust at the back. A noise that survives all of that and tracks a moving part is a service call. A noise with no other symptom and no change in cooling is usually the appliance working.
Sources — The symptom-report corpus recorded against Bosch B refrigerator pages for this fault is cited below. No share is quoted from it anywhere on this page: the snapshot reaches this page as a provenance chain without values, so every ordering here is technician judgement rather than a measured proportion.
Documented- amazon-reviews — amazon-reviews, fetched 2026-09-02
Other faults covered for the B family
SC
Sarah Chen
Lead Appliance Repair Technician · 12 years experience
EPA 608 UniversalNASTeC Certified
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
