mypros+
Error code reference

Sub-Zero Refrigerator Error Code 10 F 00

Freezer evaporator thermistor open circuit.

Sub-Zero codesSub-Zero refrigerator codes

Freezer 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.

MyPros+ Max

Get the full diagnostic procedure for 10 F 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 F 00 means on a Sub-Zero refrigerator

Error code 10 F 00 on a Sub-Zero refrigerator indicates an open circuit condition in the freezer evaporator thermistor. The thermistor is a negative temperature coefficient (NTC) resistor mounted on or near the freezer evaporator coil. Its job is to continuously report evaporator temperature to the control board, allowing the system to regulate defrost cycles and compressor operation. An open circuit means the control board is receiving no signal at all from this sensor, rather than a reading that is simply out of range.

The correct resistance for the freezer evaporator thermistor at approximately 0°C (32°F) is 30,000 to 33,000 ohms. When the circuit is open, resistance reads as infinite or OL on a multimeter, which tells the board the sensor is either broken internally or disconnected entirely. This is distinct from a short circuit fault, where resistance would read near zero. The control board cannot make accurate defrost or cooling decisions without valid thermistor data, which is why this code triggers a fault condition.

Common causes include thermistor failure due to age or moisture exposure, damaged wiring in the harness running from the evaporator to the control board, and corroded or loose connector pins at either the thermistor or board end. Physical damage from ice buildup during a failed defrost cycle can also stress or break the thermistor lead wires. Diagnosing the fault begins with the ice water resistance test to confirm whether the thermistor itself is defective before inspecting the wiring harness and connectors.

Source: manufacturer service documentation.

Common causes of 10 F 00

  1. 01

    Failed freezer evaporator thermistor

    Part replacement

    The thermistor itself has developed an internal open circuit, often due to age, moisture ingress, or physical damage. Submerging it in ice water and measuring resistance outside the 30,000 to 33,000 ohm range confirms the part has failed.

  2. 02

    Broken or damaged thermistor lead wires

    Part replacement

    The small wires connecting the thermistor to the harness can crack or break, especially if ice buildup has put mechanical stress on them. Visually inspect the wires close to the thermistor body for any breaks, kinks, or fraying.

  3. 03

    Loose or corroded wiring harness connector

    Wiring / connection

    The connector joining the thermistor wiring to the main harness can loosen over time or develop corrosion on the pins, breaking the circuit. Inspect the connector for oxidation, bent pins, or an incomplete seating, and clean or reseat as needed.

  4. 04

    Damaged wiring harness between evaporator and control board

    Part replacement

    A section of the wiring harness routing from the evaporator area to the control board may be pinched, chafed, or broken. Continuity testing along the full length of the circuit will isolate any break in the harness.

  5. 05

    Control board failure

    Part replacement

    In rare cases the control board itself may have a faulty thermistor input circuit, causing it to report an open condition even when the thermistor and wiring are intact. This should only be considered after the thermistor and all wiring have been tested and confirmed good.

See the test procedure for each cause

Frequently asked questions about 10 F 00

What does 10 F 00 mean on a Sub-Zero refrigerator?
Error code 10 F 00 means the control board is detecting an open circuit on the freezer evaporator thermistor. The thermistor is a temperature sensor mounted near the freezer evaporator coil, and an open circuit means the board is receiving no resistance signal from it at all. This prevents the appliance from accurately managing freezer cooling and defrost timing. The fault points to either a failed thermistor, broken wiring, or a bad connector in that circuit.
Can I fix error code 10 F 00 myself?
A knowledgeable DIYer can begin by testing the thermistor using the ice water resistance method, checking for 30,000 to 33,000 ohms at 0°C. If the thermistor tests out of range or reads open, replacing it is a straightforward repair that involves accessing the freezer evaporator compartment and swapping the sensor. Wiring and connector inspection can also be done without special tools. However, if the fault traces back to the control board, professional service is recommended.
Is it safe to keep using my Sub-Zero refrigerator while error 10 F 00 is active?
With this fault active, the control board cannot rely on accurate evaporator temperature data, which can compromise defrost cycle timing and overall cooling performance. Food safety may be at risk if the freezer temperature is not being properly maintained. It is advisable to check actual freezer temperatures with a separate thermometer and limit use until the fault is resolved.
How much does it cost to repair error code 10 F 00 on a Sub-Zero refrigerator?
If the repair only requires a new evaporator thermistor, parts typically cost in the range of $20 to $60 depending on the specific model. If professional labor is involved, total repair costs generally fall between $150 and $400 when combining parts and service time. Repairs that require control board replacement will be more expensive, often ranging from $400 to $800 or higher for Sub-Zero units.
Will resetting my Sub-Zero refrigerator clear error code 10 F 00?
Resetting the unit may temporarily clear the displayed code, but the error will return as soon as the control board checks the thermistor circuit again and finds the open condition still present. The underlying fault, whether a failed thermistor, broken wire, or bad connector, must be physically diagnosed and repaired before the code will stay cleared. Do not rely on a reset as a fix for this error.

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