mypros+
Error code reference

Sub-Zero Refrigerator Error Code 10 2 00

Zone 2 cabinet thermistor open circuit detected.

Sub-Zero codesSub-Zero refrigerator codes

Zone 2 cabinet thermistor open circuit detected.

First step from the service manual

Check ohms and verify temperature readings.

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

MyPros+ Max

Get the full diagnostic procedure for 10 2 00.

  • 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 10 2 00 means on a Sub-Zero refrigerator

Error code 10 2 00 on a Sub-Zero refrigerator indicates that an open circuit has been detected in the Zone 2 cabinet thermistor. A thermistor is a temperature-sensitive resistor that changes its electrical resistance based on the surrounding temperature. When the control board reads an open circuit from this sensor, it means the circuit is broken and no usable resistance value is being returned. This prevents the refrigerator from accurately monitoring Zone 2 cabinet temperatures, which can compromise temperature regulation and food safety in that zone.

The most reliable initial diagnostic step is to measure the thermistor's resistance with a multimeter and cross-reference that reading against the expected resistance-to-temperature curve for the sensor. A healthy thermistor will return a finite resistance value. A completely open circuit will return an infinite or overrange reading (OL), confirming the sensor or its wiring has failed. Temperature readings displayed by the unit should also be checked to see whether they appear erratic, frozen at an impossible value, or completely absent.

Common causes include a failed thermistor that has internally broken, damaged wiring between the thermistor and control board, a corroded or disconnected harness connector, or in rarer cases, a faulty control board that is misreading a functioning sensor. Physical inspection of the wiring harness running from the Zone 2 sensor location to the board is an important secondary step after initial resistance measurement.

Source: manufacturer service documentation.

Common causes of 10 2 00

  1. 01

    Failed Zone 2 cabinet thermistor

    Part replacement

    The thermistor itself has developed an internal break, causing it to return an open circuit reading. Measuring resistance across the sensor terminals will show an infinite or OL reading instead of a finite value.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wiring between the Zone 2 thermistor and the control board may be cut, pinched, or otherwise damaged. Visually inspecting the harness routing and checking continuity along each wire can isolate this problem.

  3. 03

    Disconnected or corroded connector

    Wiring / connection

    The harness connector at the thermistor or at the control board may have come loose or developed corrosion that breaks electrical contact. Inspect all connectors in the Zone 2 sensor circuit and clean or reseat them as needed.

  4. 04

    Moisture intrusion at the sensor or connector

    Part replacement

    Condensation or water exposure inside the cabinet can corrode sensor terminals and connector pins over time, eventually causing an open circuit. Look for signs of corrosion or oxidation at the connection points.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all associated wiring test correctly, the control board itself may be failing to read the sensor circuit accurately. This is the least likely cause and should only be considered after the sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about 10 2 00

What does 10 2 00 mean on a Sub-Zero refrigerator?
Error code 10 2 00 indicates that the Zone 2 cabinet thermistor has an open circuit. This means the control board is not receiving a valid resistance signal from the temperature sensor in that zone. The refrigerator cannot accurately regulate Zone 2 temperatures until the fault is resolved. The first step is to check the thermistor's resistance with a multimeter and verify what temperature readings the unit is displaying.
Can I fix error code 10 2 00 myself?
A knowledgeable DIYer can start by inspecting the wiring harness and connectors in the Zone 2 thermistor circuit for obvious damage or disconnection, and by testing the thermistor resistance with a multimeter. If the sensor reads open or infinite resistance, replacing the thermistor is a straightforward parts swap in most cases. However, if the wiring or control board is involved, professional diagnosis is recommended to avoid further damage.
Is it safe to keep using my Sub-Zero refrigerator while error 10 2 00 is active?
Operating the refrigerator with this error active means Zone 2 temperatures may not be properly controlled or monitored. Food stored in that zone could be at risk if temperatures drift outside safe ranges. It is advisable to check actual temperatures manually and minimize use of the affected zone until the fault is repaired.
How much does it cost to repair error code 10 2 00 on a Sub-Zero refrigerator?
Repair costs depend on the root cause. A thermistor replacement is generally the least expensive fix, with parts typically ranging from $20 to $80 and labor adding $100 to $200 depending on your area. If the wiring harness or control board needs replacement, total costs can range from $200 to $600 or more. Getting a diagnostic visit from a Sub-Zero authorized service technician will clarify the exact repair needed.
Will resetting the refrigerator clear error code 10 2 00?
A power reset may temporarily clear the displayed error code, but the fault will return if the underlying problem with the Zone 2 thermistor or its wiring has not been corrected. Resetting without repairing the cause is not a solution and could delay addressing a temperature control issue that affects food safety. The error should be diagnosed and repaired rather than simply reset.

Related Sub-Zero refrigerator codes

All Sub-Zero refrigerator codes
View all 296 Sub-Zero refrigerator codes

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

Get Started

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