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Bosch Refrigerator E3 Error Code: Freezer Temperature Sensor Fault

Quick Answer

Bosch E3 targets the freezer compartment temperature sensor (distinct from E2 which is the ice maker sensor). The freezer sensor on Bosch models is an NTC thermistor mounted on the evaporator assembly behind the rear panel inside the freezer. E3 triggers when this sensor reads open circuit, short circuit, or values far outside the expected temperature range.

Bosch E3 targets the freezer compartment temperature sensor (distinct from E2 which is the ice maker sensor). The freezer sensor on Bosch models is an NTC thermistor mounted on the evaporator assembly behind the rear panel inside the freezer. E3 triggers when this sensor reads open circuit, short circuit, or values far outside the expected temperature range. Without accurate freezer temperature feedback, the compressor may run continuously or not enough. Bosch NTC freezer sensors read approximately 5K-10K ohms at freezer temperatures (-10 to 0F). Check resistance at the main board connector.

BoschRefrigeratorSeverity: mediumDifficulty: intermediate75% DIY Success
Time to Fix
15–120 min
Difficulty
intermediate
Parts Cost
$20 – $40
Tools Needed
Multimeter, Flashlight

What Does the E3 Code Mean?

E3 = freezer temperature sensor fault. NTC thermistor behind freezer rear panel. Check resistance at board connector. Replace sensor ($20-40).

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Freezer sensor failed (open circuit)40%
Sensor wire broken behind rear panel24%
Sensor connector corroded14%
Sensor reading out of spec from age12%
Ice buildup around sensor10%

Symptoms You May Notice

  • E3 on display
  • Freezer too cold or too warm
  • Compressor running constantly
  • Food partially thawed
  • Frost buildup in freezer

Can you reset a Bosch refrigerator to clear the E3 code?

Unplug for 5 minutes. Most refrigerator error codes clear on power cycle if the underlying issue is resolved.

Tools Required for Diagnosis

MultimeterFlashlightScrewdriver set

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Unplug the refrigerator

Unplug the refrigerator. Remove the rear panel inside the freezer (usually 4-6 screws). Locate the freezer sensor on or near the evaporator coil. It is a small probe with 2 wires.

2

Disconnect the sensor and measure resistance

3

Install new sensor in the same position

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Bosch Freezer Temperature SensorModel-specific · $20–$40

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $30 (Parts) vs $4000 (New Machine)

Frequently Asked Questions

E2 vs E3 on Bosch fridge?
E2 = ice maker sensor. E3 = freezer compartment sensor. Different sensors, different locations. E2 affects ice production only. E3 affects overall freezer temperature control.
Can I run my Bosch fridge with E3 showing?
The fridge will try to operate but without accurate freezer temperature feedback, the compressor may run too much (freezing everything solid) or too little (food thawing). Fix E3 promptly for food safety.
Where exactly is the E3 sensor in my Bosch?
Behind the rear panel inside the freezer compartment. Remove the panel screws, carefully pull it forward. The sensor is clipped to or near the evaporator coil assembly. It is a small probe with a 2-wire connector.

Related Bosch Refrigerator Error Codes

Code: E2Bosch E2: Ice Maker Sensor

Same Fix Works on These Brands

Bosch shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience E3 Errors

This repair applies to most Bosch refrigerators with this error code. Common model numbers include:

B36CL80SNS, B36CT80SNS, B36CD50SNS

Last verified for technical accuracy on March 15, 2026