mypros+
Error code reference

Thermador Refrigerator Error Code E02

Freezer compartment sensor break or short circuit.

Thermador codesThermador refrigerator codes

Freezer compartment sensor break or short circuit.

MyPros+ Max

Get the full diagnostic procedure for E02.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E02 means on a Thermador refrigerator

The E02 error code on a Thermador refrigerator indicates a fault detected in the freezer compartment temperature sensor, specifically a break (open circuit) or short circuit condition. This sensor is a thermistor, a resistive component whose electrical resistance changes predictably with temperature. The refrigerator's control board continuously monitors the resistance signal from this thermistor to determine freezer temperature and regulate the compressor and evaporator fan accordingly. When the resistance reading falls outside the expected range, either spiking to an abnormally high value (indicating an open/broken circuit) or dropping near zero (indicating a short circuit), the control board triggers E02 and flags the sensor as faulty.

The freezer compartment sensor is typically located inside the freezer cavity, often positioned near the evaporator coils or along the rear wall. It connects to the main control board via a wiring harness. Causes of this fault include physical damage to the sensor probe itself, deterioration of the thermistor element over time, or damage to the wiring harness running between the sensor and the control board. Connector pins can corrode, back out of their housings, or suffer intermittent contact failures that produce the same open or short circuit readings.

When E02 is active, the refrigerator loses its ability to accurately monitor freezer temperature, which can result in improper cooling cycles, compressor overrun, or inadequate freezing performance. Diagnosing this code requires a multimeter to test thermistor resistance at the sensor connector and to check wiring continuity along the full length of the harness. If the wiring harness tests good, the thermistor itself is the most probable failed component and will need replacement.

Source: manufacturer service documentation.

Common causes of E02

  1. 01

    Failed freezer thermistor

    Part replacement

    The thermistor probe itself can fail internally, producing a resistance value that is either extremely high (open circuit) or near zero (short circuit). Testing the sensor with a multimeter and comparing the resistance reading to the expected value at a known temperature will confirm this failure.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wire harness connecting the freezer sensor to the control board can develop breaks, kinks, or cuts, particularly at points where the harness flexes or is routed around sharp edges. Visually inspecting the harness and testing continuity with a multimeter will identify a broken wire.

  3. 03

    Corroded or loose sensor connector

    Wiring / connection

    The connector between the thermistor and the wiring harness can develop corrosion on the pins or a loose fit, causing an intermittent or total loss of signal. Inspecting the connector for green or white corrosion deposits and ensuring the connector is fully seated can resolve this issue.

  4. 04

    Ice buildup around the sensor

    Wiring / connection

    Excessive frost or ice accumulation near the evaporator area can encase the sensor and, in some cases, damage its wiring or connection point. Running a manual defrost cycle and inspecting the sensor condition after the ice melts can rule out or confirm this cause.

  5. 05

    Faulty main control board

    Part replacement

    If the thermistor and all wiring test within specification, the control board's sensor input circuit may have failed, causing it to misread or not read the sensor signal at all. This is the least common cause and should only be considered after all other components have been tested and cleared.

See the test procedure for each cause

Frequently asked questions about E02

What does E02 mean on a Thermador refrigerator?
E02 on a Thermador refrigerator indicates a break or short circuit in the freezer compartment temperature sensor. The control board monitors this sensor continuously and triggers E02 when the resistance signal falls outside the acceptable range. This can be caused by a failed thermistor, damaged wiring, or a corroded connector. The refrigerator cannot regulate freezer temperature accurately while this fault is active.
Can I fix the E02 error on my Thermador refrigerator myself?
A knowledgeable DIYer can diagnose E02 by using a multimeter to test the freezer thermistor resistance and check wiring harness continuity. Cleaning a corroded connector or reseating a loose plug are also straightforward repairs. Replacing the thermistor probe itself is a moderate-difficulty repair involving accessing the freezer interior and disconnecting the sensor from the harness. If the fault points to the main control board, professional service is recommended.
Is it safe to keep using my refrigerator while E02 is displayed?
Operating the refrigerator with an active E02 fault is not advisable for extended periods. Without a functioning freezer sensor, the control board cannot accurately regulate freezer temperature, which may lead to insufficient freezing or compressor overrun. Food safety can be compromised if the freezer temperature rises above safe levels. It is best to transfer frozen goods to a backup freezer and address the fault promptly.
How much does it cost to repair the E02 error on a Thermador refrigerator?
If the repair only requires a replacement freezer thermistor, parts typically cost in the range of $15 to $60 depending on the specific model. Professional labor for this type of sensor replacement generally adds $100 to $200 to the total. If the wiring harness requires repair or replacement, costs can increase. A control board replacement, if needed, is the most expensive outcome and can range from $200 to $500 or more for parts alone.
Will resetting my Thermador refrigerator clear the E02 error code?
A power reset, performed by unplugging the refrigerator for several minutes and then restoring power, may temporarily clear the E02 code. However, if the underlying fault in the sensor or wiring is still present, the error will return once the control board completes its diagnostic cycle. A reset alone does not fix the root cause. The fault must be properly diagnosed and the defective component repaired or replaced to permanently clear the code.

Related Thermador refrigerator codes

All Thermador refrigerator codes
View all 49 Thermador refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass