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Error code reference

Sub-Zero Refrigerator Error Code 10 r 01

Refrigerator evaporator thermistor shorted/closed.

Sub-Zero codesSub-Zero refrigerator codes

Refrigerator evaporator thermistor shorted/closed.

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What 10 r 01 means on a Sub-Zero refrigerator

Error code 10 r 01 on a Sub-Zero refrigerator indicates that the refrigerator compartment evaporator thermistor has been detected in a shorted or closed condition. The evaporator thermistor is a negative temperature coefficient (NTC) sensor positioned near the evaporator coil inside the refrigerator section. Its job is to continuously report evaporator temperature to the control board, allowing the system to regulate defrost cycles and compressor operation accurately. A shorted thermistor means its internal resistance has dropped to a very low or near-zero value, which causes the control board to read an implausibly low temperature signal.

When the thermistor shorts internally, the control board can no longer trust the temperature data coming from that sensor. This can disrupt defrost timing, cause the refrigerator section to run too cold, or trigger protective shutdowns. The fault is specific to the refrigerator evaporator sensor and does not affect the freezer section thermistors or other sensors in the system.

The most common physical causes include thermistor wiring that has been pinched, chafed, or shorted against the evaporator housing, a failed thermistor with internal component breakdown, or moisture intrusion into the sensor or its connector causing a conductive short. Diagnosing the fault requires disconnecting the thermistor from the control board and measuring its resistance with a multimeter. A shorted thermistor will show near-zero ohms rather than the several thousand ohms expected at normal refrigerator temperatures.

Source: manufacturer service documentation.

Common causes of 10 r 01

  1. 01

    Failed evaporator thermistor

    Part replacement

    The thermistor itself has experienced internal component failure, causing its resistance to drop to near zero. Testing the sensor directly with a multimeter will confirm a shorted reading instead of the expected resistance value in the kilohm range.

  2. 02

    Pinched or damaged thermistor wiring

    Part replacement

    The wiring harness running from the evaporator thermistor to the control board can become pinched against metal panels or chafed, creating a short circuit in the wire. Visually inspect the harness routing for any areas of wear, pinching, or insulation damage.

  3. 03

    Moisture or ice intrusion at the connector

    Wiring / connection

    Water or ice accumulation inside the thermistor connector or along the harness can create a conductive path that mimics a shorted sensor. Inspecting and drying the connector, then re-testing, can help isolate whether moisture is the cause.

  4. 04

    Corroded or contaminated connector terminals

    Wiring / connection

    Corrosion at the thermistor plug or the control board connector can cause abnormal resistance readings. Cleaning the terminals and reseating the connector may resolve the fault if no other damage is present.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the control board itself misreads a healthy thermistor as shorted due to a failed input circuit. This should only be suspected after confirming the thermistor and wiring both test within normal specifications.

See the test procedure for each cause

Frequently asked questions about 10 r 01

What does 10 r 01 mean on a Sub-Zero refrigerator?
Error code 10 r 01 indicates that the refrigerator compartment evaporator thermistor has been detected in a shorted or closed condition. The evaporator thermistor monitors the temperature of the cooling coils inside the refrigerator section and reports that data to the control board. A shorted thermistor produces a near-zero resistance reading, which the board recognizes as an invalid signal and flags with this code. The fault points to the thermistor itself, its wiring harness, or its connector.
Can I fix error code 10 r 01 myself on a Sub-Zero refrigerator?
A knowledgeable DIYer can perform basic diagnostics such as inspecting the thermistor wiring for visible damage, checking the connector for moisture or corrosion, and testing the thermistor resistance with a multimeter. If the thermistor reads near-zero ohms, replacing the sensor is the likely fix. However, accessing the evaporator compartment on Sub-Zero units often requires removing interior panels, and some technicians recommend professional service to avoid damaging sealed components.
Is it safe to keep using my refrigerator while error code 10 r 01 is active?
A shorted evaporator thermistor can disrupt the control board's ability to manage defrost cycles and compressor operation accurately, which may cause the refrigerator section to run at incorrect temperatures. Food safety can be compromised if the compartment becomes too warm or too cold without proper regulation. It is advisable to monitor internal temperatures closely with a thermometer and address the fault promptly rather than continuing normal use.
Will resetting my Sub-Zero refrigerator clear error code 10 r 01?
A power reset may temporarily clear the error from the display, but the code will return if the underlying fault in the thermistor or its wiring has not been corrected. Resetting the unit without repairing the cause does not fix the shorted sensor condition. The error should be diagnosed and the faulty component repaired or replaced before expecting the code to stay cleared.
How much does it cost to repair error code 10 r 01 on a Sub-Zero refrigerator?
Repair costs vary depending on whether the issue is a failed thermistor, damaged wiring, or a control board problem. A thermistor replacement is generally the least expensive repair, with parts and labor typically ranging from around $150 to $350 depending on your location and service rates. If wiring repairs or a control board replacement are needed, costs can be significantly higher, potentially ranging from $300 to $700 or more for a full diagnosis and repair on a Sub-Zero unit.

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