Sub-Zero Refrigerator Error Code 10 1 00

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.

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.

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.

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.

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.