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Error code reference

Sub-Zero Refrigerator Error Code 10 1 00

Refrigerator compartment thermistor open circuit.

Sub-Zero codesSub-Zero refrigerator codes

Refrigerator compartment 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 to 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 1 00 means on a Sub-Zero refrigerator

Error code 10 1 00 on a Sub-Zero refrigerator indicates an open circuit condition in the refrigerator compartment thermistor. The thermistor is a negative temperature coefficient (NTC) resistor that continuously reports compartment temperature to the main control board. When the control board detects no signal or an out-of-range resistance reading from this sensor, it flags the open circuit fault and stores code 10 1 00. An open circuit means the electrical path through the thermistor has been broken entirely, sending the control board either infinite resistance or no readable signal at all.

The refrigerator compartment thermistor is critical to temperature regulation. The control board uses its readings to cycle the compressor and evaporator fan, maintaining the set temperature. With an open circuit on this sensor, the board cannot accurately regulate cooling in the fresh food section, which can result in temperature drift and potential food safety concerns.

The most reliable field test for this thermistor is a cold-water resistance check: submerge the sensor in an ice water bath near 0 degrees Celsius (32 degrees Fahrenheit) for 5 minutes and measure resistance across its terminals. A healthy thermistor will read between 30,000 and 33,000 ohms at that temperature. A reading of infinite resistance or open line (OL) on the meter confirms the thermistor has failed internally. Wiring harness damage, connector corrosion, or a broken wire between the sensor and the control board can also produce this fault even if the thermistor itself tests good.

Source: manufacturer service documentation.

Common causes of 10 1 00

  1. 01

    Failed thermistor (internal open circuit)

    Part replacement

    The thermistor element itself has broken internally, eliminating the electrical path through the sensor. Confirmed by an infinite resistance reading during the ice water test instead of the expected 30,000 to 33,000 ohms.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wire running from the thermistor to the control board may have cracked, been pinched by a drawer or shelf, or broken at a stress point. Inspect the full wire run for visible damage and check continuity through each conductor.

  3. 03

    Corroded or disconnected connector

    Wiring / connection

    Moisture inside the refrigerator compartment can corrode the thermistor connector pins, creating an intermittent or permanent open circuit. Unplug and inspect the connector for green or white corrosion buildup and ensure it is fully seated.

  4. 04

    Control board input failure

    Part replacement

    If the thermistor and its wiring test good, the thermistor input circuit on the main control board may have failed. This is less common but should be considered after ruling out the sensor and harness.

See the test procedure for each cause

Frequently asked questions about 10 1 00

What does 10 1 00 mean on a Sub-Zero refrigerator?
Code 10 1 00 means the control board has detected an open circuit in the refrigerator compartment thermistor. The thermistor is the temperature sensor that monitors the fresh food section and sends resistance-based readings to the control board. When that circuit is broken, the board cannot regulate compartment temperature correctly and flags the fault. The cause is typically a failed thermistor, damaged wiring, or a corroded connector.
Can I fix error code 10 1 00 myself?
A knowledgeable DIYer can test the thermistor by submerging it in ice water and measuring resistance with a multimeter. A reading outside 30,000 to 33,000 ohms at 0 degrees Celsius confirms the sensor needs replacement. Checking and reseating the wiring connector is also straightforward. Replacing the thermistor itself is generally a simple plug-and-play repair, though accessing the sensor may require removing shelving or interior panels depending on the model.
Will resetting my Sub-Zero clear the 10 1 00 error code?
A reset may temporarily clear the code from the display, but if the underlying open circuit condition still exists, the fault will return as soon as the control board rechecks the thermistor circuit. Clearing the code without repairing the sensor or wiring does not restore proper temperature control. The fault must be resolved at the component level for the code to stay cleared.
Is it safe to use my refrigerator while error 10 1 00 is active?
Running the refrigerator with an active thermistor open circuit fault means the control board cannot accurately monitor compartment temperature. The fresh food section may not hold a safe temperature, putting perishable food at risk. It is best to minimize use, check compartment temperature with a standalone thermometer, and arrange for repair as soon as possible.
How much does it cost to repair error code 10 1 00 on a Sub-Zero refrigerator?
If only the thermistor needs replacement, parts typically range from around 20 to 60 dollars depending on the specific model, with professional labor adding roughly 100 to 200 dollars for a standard service call. If the control board is at fault, repair costs increase significantly, as board replacement on Sub-Zero units can range from 300 to 600 dollars or more for parts alone. Getting a diagnostic visit from a qualified technician will help confirm the exact failed component before committing to parts costs.

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