Bosch Factory Service ManualFault Code: E02

Bosch Refrigerator Error Code E02: Freezer Evaporator Temperature Sensor Defect

The NTC thermistor sensor clipped to the freezer evaporator coil is reporting an open circuit, short circuit, or erratic reading outside normal range.

Target Appliance

refrigerator

OEM Certified Technical Diagnostic Tree

Diagnostic Tool Required

Digital Multimeter

Measure Ohms resistance, continuity & line voltage.

Triage Complexity

Advanced Diagnostic

4 Sequential manufacturer inspection branches.

Sequential Factory Diagnostic Tree

Perform each diagnostic step in order. Disconnect electrical power and turn off utility shutoffs before inspecting wiring or internal mechanical assemblies.

Step 1: Physical & Electrical InspectionMultimeter & Visual

Action: Disconnect power, remove freezer rear interior back panel to access the evaporator coil and NTC thermistor.

Bench Test: Inspect NTC sensor casing for cracked plastic, moisture ingress, or frost heave damage.

Expected Standard: Sensor probe sealed, clipped firmly to suction line or upper coil return bend.

If Failed / Out of Spec:

Replace evaporator NTC temperature sensor (00623143).

If Passed:

Proceed to Step 2.

Step 2: Physical & Electrical InspectionMultimeter & Visual

Action: Measure sensor resistance in an ice water bath (32°F / 0°C).

Bench Test: Submerge sensor tip in ice bath and measure resistance across sensor wire leads.

Expected Standard: 16,300 ohms (16.3k Ω) at 32°F; approximately 5k Ω at room temperature (77°F).

If Failed / Out of Spec:

Resistance out of tolerance (0L or 0 ohms). Replace sensor (00623143).

If Passed:

Proceed to Step 3.

Step 3: Physical & Electrical InspectionMultimeter & Visual

Action: Test wiring harness continuity from freezer interior connector to main control PCB in rear machine compartment.

Bench Test: Check continuity across sensor harness pins.

Expected Standard: 0 ohms continuity; clean pins with zero corrosion.

If Failed / Out of Spec:

Repair harness wiring or replace molex connector.

If Passed:

Proceed to Step 4.

Step 4: Physical & Electrical InspectionMultimeter & Visual

Action: Inspect main electronic control PCB in rear compressor compartment.

Bench Test: Check sensor input DC circuit traces for burned components or cold solder joints.

Expected Standard: 5V DC reference voltage delivered across sensor terminals from PCB.

If Failed / Out of Spec:

Replace main electronic control board (11020478).

If Passed:

Run diagnostic self-test to clear fault history.

Verified OEM Replacement Parts

Cross-referenced factory part numbers for Bosch refrigerator error code E02. Always replace defective components with authentic OEM parts to maintain UL safety certification.

Component Name	OEM Part Number	Manufacturer	Status
Freezer Evaporator NTC Thermistor Sensor	`00623143`	Bosch	Direct Fit OEM
Main Electronic Power Control Board	`11020478`	Bosch	Direct Fit OEM
Defrost Heater & Bimetal Thermostat Assembly	`00649363`	Bosch	Direct Fit OEM

Need Local Diagnostic Assistance?

Connect with a Certified Bosch Technician in Your Area

If multimeter testing reveals an internal short, locked motor, or fried control board, let an experienced local technician complete the repair with certified OEM replacement parts.

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Frequently Asked Questions: Bosch E02

What causes Bosch refrigerator error code E02?

The NTC thermistor sensor clipped to the freezer evaporator coil is reporting an open circuit, short circuit, or erratic reading outside normal range.

Can I reset the E02 code by unplugging the refrigerator?

While disconnecting power for 5 minutes may temporarily clear the display control memory, the E02 code will reoccur once the microcontroller detects the mechanical or electrical fault again.

What OEM replacement parts are required for Bosch E02?

Common OEM replacement components include: Freezer Evaporator NTC Thermistor Sensor (OEM #00623143), Main Electronic Power Control Board (OEM #11020478), Defrost Heater & Bimetal Thermostat Assembly (OEM #00649363).