Thermador Refrigerator Error Code E02 — Freezer Compartment Sensor Fault
What this means
Error E02 on Thermador refrigerators indicates the freezer compartment temperature sensor (NTC thermistor) is sending an out-of-range signal to the main control board. Without accurate freezer temperature data, the compressor and defrost system cannot operate correctly. The freezer may overcool, undercool, or fail to defrost. Causes are the same as E01 — a failed thermistor, a loose connector, or a damaged wire — but the affected sensor is in the freezer rather than the fresh food compartment.
Alternate codes: Er 02, Err 02
Step-by-step fix
3 stepsPower reset the refrigerator
Turn off the breaker or unplug the unit for 5 minutes. Restore power and check if the E02 code clears after the system reinitializes.
If the freezer is significantly overcooling or not cooling at all, check the actual freezer temperature with a standalone thermometer after the reset.
Locate and test the freezer thermistor
The freezer sensor is usually located near the freezer evaporator or clipped to the evaporator cover inside the freezer compartment. Remove any shelves or panels needed to access it. Disconnect the wire harness and measure resistance. At 0°F (-18°C — normal freezer temperature), expect about 30,000–35,000 ohms. At room temperature, about 10,000–12,000 ohms.
If you test the sensor at room temperature after removing it from the freezer, it should read similarly to the fresh food sensor — around 10K–12K ohms. The readings differ only when at their operating temperatures.
Replace the freezer thermistor
Unclip the sensor, disconnect the connector, and install the replacement. Route the wire exactly as the original to avoid pinching. Reinstall any panels or covers and restore power.
Allow 24 hours after replacement for the freezer to fully stabilize and the control board to confirm the error is resolved.
When to call a professional
If the thermistor and wiring are both good but E02 persists, the main control board's sensor input circuit may be faulty — this requires professional board-level diagnosis.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Freezer Temperature Sensor (NTC Thermistor)
Part #00617855 · $15–$35
If sensor reads open, shorted, or significantly out of range
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