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Error code reference

Sub-Zero Refrigerator Error Code 10 r 00

Refrigerator evaporator thermistor open circuit.

Sub-Zero codesSub-Zero refrigerator codes

Refrigerator evaporator thermistor open circuit.

First step from the service manual

Test thermistor by submersing in ice water (~0°C/~32°F) for 5 minutes, check for 30,000-33,000 ohms.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What 10 r 00 means on a Sub-Zero refrigerator

Error code 10 r 00 on a Sub-Zero refrigerator indicates an open circuit condition in the refrigerator compartment evaporator thermistor. The evaporator thermistor is a negative temperature coefficient (NTC) resistive sensor mounted near the evaporator coil inside the refrigerator section. Its job is to continuously report evaporator temperature to the control board so the system can regulate defrost cycles and compressor operation accurately. When the control board detects an open circuit, it means the electrical signal from the thermistor has been completely lost, which is distinct from a reading that is simply out of range.

An open circuit in this context means the resistance through the thermistor circuit has risen to an effectively infinite level, so no usable signal reaches the control board. At approximately 0 degrees Celsius, a properly functioning evaporator thermistor should measure between 30,000 and 33,000 ohms. An open circuit will typically read well above this range or show no continuity at all. The control board cannot distinguish between a valid high-resistance reading caused by extremely cold temperatures and a broken circuit, so it flags the fault code to alert the technician.

Common sources of this fault include thermistor element failure, damaged wiring harness connections between the thermistor and the control board, or corrosion at connector terminals caused by moisture exposure near the evaporator. Physical damage from ice buildup pressing against the sensor wire is also a known contributor in units that have experienced heavy frost accumulation due to a prior defrost system problem.

Source: manufacturer service documentation.

Common causes of 10 r 00

  1. 01

    Failed evaporator thermistor

    Part replacement

    The thermistor element itself has failed internally, breaking the circuit. Submerging it in ice water and measuring resistance higher than 33,000 ohms or getting no reading at all confirms the sensor needs replacement.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wire running from the thermistor to the control board connector can crack or break due to repeated freezing and thawing, ice pressure, or physical stress during servicing. Inspect the full length of the wire for visible damage or breaks.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    Moisture near the evaporator can cause oxidation at the wiring harness connector pins, increasing resistance enough to trigger an open circuit fault. Disconnecting and inspecting the connector for green or white corrosion deposits is the key diagnostic step.

  4. 04

    Ice accumulation pressing on the sensor wire

    Part replacement

    Excessive frost buildup from a separate defrost system issue can physically compress or fracture the thermistor wire. This is often found alongside evidence of heavy ice accumulation on the evaporator coil.

See the test procedure for each cause

Frequently asked questions about 10 r 00

What does 10 r 00 mean on a Sub-Zero refrigerator?
Error code 10 r 00 means the control board has detected an open circuit in the refrigerator compartment evaporator thermistor. The thermistor is a temperature sensor located near the evaporator coil, and an open circuit means the board is receiving no usable signal from it. The correct resistance for this sensor is 30,000 to 33,000 ohms when tested in ice water at approximately 0 degrees Celsius. A reading outside that range or no reading at all confirms the circuit has failed.
Can I fix error code 10 r 00 myself?
A knowledgeable DIYer can perform the initial thermistor resistance test using a multimeter and a cup of ice water. If the thermistor tests out of the 30,000 to 33,000 ohm range, replacing the sensor is a feasible repair for someone comfortable working inside a refrigerator evaporator compartment. However, if the wiring harness or connector is the cause, tracing and repairing the circuit requires more experience, and if the control board itself is involved, professional diagnosis is recommended.
Is it safe to keep using my Sub-Zero refrigerator when error 10 r 00 is displayed?
Continued use with this fault active is not advisable for extended periods. Without a functioning evaporator thermistor, the control board cannot accurately manage defrost cycles or compressor operation in the refrigerator section, which can lead to temperature instability and potential food spoilage. Short-term use while waiting for a repair appointment is generally low risk, but you should monitor food temperatures closely with an independent thermometer.
How much does it cost to repair error code 10 r 00 on a Sub-Zero refrigerator?
If only the evaporator thermistor needs replacement, parts and labor typically fall in the range of $150 to $350 depending on your location and service provider. If the wiring harness requires repair or replacement, costs can rise to the $300 to $600 range. Sub-Zero appliances generally carry higher service costs than standard brands due to parts pricing and the specialized technician knowledge required.
Will resetting my Sub-Zero refrigerator clear error code 10 r 00?
A reset may temporarily clear the fault code from the display, but the code will return as soon as the control board re-checks the thermistor circuit and finds the same open circuit condition. Resetting does not address the underlying hardware failure in the sensor or wiring. The fault must be corrected by repairing or replacing the defective component before the code will clear permanently.

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