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Bosch · B30IR900SP 30 in Benchmark Built-In All Refrigerator

Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator E3 Error Fix: Defrost Sensor / Bi-Metal Failure

The defrost termination sensor or bi-metal thermostat on the evaporator has failed. The defrost cycle cannot terminate properly, leading to excessive frost buildup on the evaporator coils or incomplete defrost that leaves ice blocking airflow. Check the evaporator sensor — usually clipped to the evaporator tubing in the freezer section. Verify defrost heater operation by running a forced defrost. Check for ice buildup on evaporator coils that indicates defrost has not been working.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E3 on the Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator means: Defrost Sensor / Bi-Metal Failure. The top-ranked community fix is “Test and Replace Defrost Termination Sensor or Bi-Metal Thermostat” (medium difficulty, ~60 min, DIY cost: $20-$30). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · refrigerator

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many refrigerator repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $110-$160.

Other Bosch Models with Error E3

B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer

refrigerator · 2 fixes

B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer

refrigerator · 2 fixes

B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door

refrigerator · 2 fixes

B36CL80SNS 36 in 800 Series French Door with VitaFreshPro

refrigerator · 2 fixes

B36CT80SNS 36 in 800 Series French Door Counter Depth

refrigerator · 2 fixes

B36FD50SNS 36 in 500 Series French Door with Quick IcePro

refrigerator · 2 fixes

B36IT80SNS 36 in Benchmark Built-In French Door

refrigerator · 2 fixes

HMB50152UC 500 Series 30 in Built-In Microwave

microwave · 2 fixes

HMC80152UC 800 Series 30 in Convection Speed Microwave

microwave · 2 fixes

HMC80252UC 800 Series 30 in Speed Microwave Oven

microwave · 2 fixes

HMD8451UC 800 Series 24 in Drawer Microwave

microwave · 2 fixes

HMV3053U 300 Series 30 in Over-the-Range Microwave

microwave · 2 fixes

HMV5053U 500 Series 30 in Over-the-Range Microwave

microwave · 2 fixes

SHE3AR75UC 24 in 100 Series Front Control 50 dBA

dishwasher · 2 fixes

SHE53C85N 24 in 300 Series Front Control 46 dBA

dishwasher · 2 fixes

SHP65CM5N 24 in 500 Series Pocket Handle 44 dBA

dishwasher · 2 fixes

SHP65TL5UC 24 in 500 Series Bar Handle 44 dBA with AutoAir

dishwasher · 2 fixes

SHP878ZD5N 24 in 800 Series Pocket Handle 42 dBA

dishwasher · 2 fixes

SHPM78Z55N 24 in 500 Series Top Control 44 dBA

dishwasher · 2 fixes

SHPM88Z75N 800 Series Dishwasher

dishwasher · 2 fixes

SHS53CD5N 24 in 300 Series Scoop Handle 46 dBA

dishwasher · 2 fixes

SHS863WD5N 24 in 300 Series Top Control 46 dBA

dishwasher · 2 fixes

SHV68TL3UC 24 in 800 Series Panel Ready 42 dBA

dishwasher · 2 fixes

SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry

dishwasher · 2 fixes

SPE68B55UC 18 in 800 Series ADA Compact 44 dBA

dishwasher · 2 fixes

Other Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator Error Codes

Refrigerator Compartment Sensor Failure

2 fixes

E10

Ambient Temperature Sensor Error

2 fixes

E11

Defrost Heater Failure

2 fixes

E12

Compressor Overload — Repeated

2 fixes

Freezer Compartment Sensor Failure

2 fixes

Compressor Start Failure

2 fixes

Communication Error — Boards

2 fixes

Evaporator Fan Motor Failure

2 fixes

People Also Ask About Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator Error E3

What does error code E3 mean on a Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator?

Error code E3 on the Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator means: Defrost Sensor / Bi-Metal Failure. The defrost termination sensor or bi-metal thermostat on the evaporator has failed. The defrost cycle cannot terminate properly, leading to excessive frost buildup on the evaporator coils or incomplete defrost that leaves ice blocking airflow. Check the evaporator sensor — usually clipped to the evaporator tubing in the freezer section. Verify defrost heater operation by running a forced defrost. Check for ice buildup on evaporator coils that indicates defrost has not been working.

How do I fix error code E3 on my Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator?

The most successful fix is "Test and Replace Defrost Termination Sensor or Bi-Metal Thermostat" (medium difficulty, ~60 minutes). Estimated DIY cost: $20-$30. HomeMD has 2 community-ranked fixes for this error.

Is error code E3 on a Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator error E3 myself?

Yes — the top-ranked community fix ("Test and Replace Defrost Termination Sensor or Bi-Metal Thermostat") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter.

How much does it cost to repair Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator error E3?

DIY cost: $20-$30. Professional repair typically costs $110-$160. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator have?

The Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator has 8 other known error codes, including: E1 (Refrigerator Compartment Sensor Failure), E10 (Ambient Temperature Sensor Error), E11 (Defrost Heater Failure), E12 (Compressor Overload — Repeated), E2 (Freezer Compartment Sensor Failure), and 3 more.

Which other Bosch models have the E3 error?

Error code E3 also appears on 25 other Bosch models: B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer, B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer, B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door, B36CL80SNS 36 in 800 Series French Door with VitaFreshPro, B36CT80SNS 36 in 800 Series French Door Counter Depth, B36FD50SNS 36 in 500 Series French Door with Quick IcePro, and 19 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator have?

The Bosch B30IR900SP 30 in Benchmark Built-In All Refrigerator has 8 other known error codes:

E1 — Refrigerator Compartment Sensor Failure (2 fixes)
E10 — Ambient Temperature Sensor Error (2 fixes)
E11 — Defrost Heater Failure (2 fixes)
E12 — Compressor Overload — Repeated (2 fixes)
E2 — Freezer Compartment Sensor Failure (2 fixes)
E4 — Compressor Start Failure (2 fixes)
E5 — Communication Error — Boards (2 fixes)
E6 — Evaporator Fan Motor Failure (2 fixes)

Which other Bosch models have the E3 error?

Error code E3 also appears on 25 other Bosch models:

B09IB81NSP 24 in 800 Series Glass Door Bottom Freezer (refrigerator) · 2 fixes
B11CB81SSS 24 in 800 Series Counter Depth Bottom Freezer (refrigerator) · 2 fixes
B21CL81SNS 36 in 800 Series Counter Depth 4-Door French Door (refrigerator) · 2 fixes
B36CL80SNS 36 in 800 Series French Door with VitaFreshPro (refrigerator) · 2 fixes
B36CT80SNS 36 in 800 Series French Door Counter Depth (refrigerator) · 2 fixes
B36FD50SNS 36 in 500 Series French Door with Quick IcePro (refrigerator) · 2 fixes
B36IT80SNS 36 in Benchmark Built-In French Door (refrigerator) · 2 fixes
HMB50152UC 500 Series 30 in Built-In Microwave (microwave) · 2 fixes
HMC80152UC 800 Series 30 in Convection Speed Microwave (microwave) · 2 fixes
HMC80252UC 800 Series 30 in Speed Microwave Oven (microwave) · 2 fixes
HMD8451UC 800 Series 24 in Drawer Microwave (microwave) · 2 fixes
HMV3053U 300 Series 30 in Over-the-Range Microwave (microwave) · 2 fixes
HMV5053U 500 Series 30 in Over-the-Range Microwave (microwave) · 2 fixes
SHE3AR75UC 24 in 100 Series Front Control 50 dBA (dishwasher) · 2 fixes
SHE53C85N 24 in 300 Series Front Control 46 dBA (dishwasher) · 2 fixes
SHP65CM5N 24 in 500 Series Pocket Handle 44 dBA (dishwasher) · 2 fixes
SHP65TL5UC 24 in 500 Series Bar Handle 44 dBA with AutoAir (dishwasher) · 2 fixes
SHP878ZD5N 24 in 800 Series Pocket Handle 42 dBA (dishwasher) · 2 fixes
SHPM78Z55N 24 in 500 Series Top Control 44 dBA (dishwasher) · 2 fixes
SHPM88Z75N 800 Series Dishwasher (dishwasher) · 2 fixes
SHS53CD5N 24 in 300 Series Scoop Handle 46 dBA (dishwasher) · 2 fixes
SHS863WD5N 24 in 300 Series Top Control 46 dBA (dishwasher) · 2 fixes
SHV68TL3UC 24 in 800 Series Panel Ready 42 dBA (dishwasher) · 2 fixes
SHX78CM5N 24 in 800 Series Bar Handle 42 dBA with CrystalDry (dishwasher) · 2 fixes
SPE68B55UC 18 in 800 Series ADA Compact 44 dBA (dishwasher) · 2 fixes

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