Sub-Zero error code · 10 1 00
Sub-Zero Error Code 10 1 00: Refrigerator Cabinet Thermistor Open (BI Series)
Sub-Zero BI series code 10 1 00 means the refrigerator cabinet thermistor reads open. Learn what it means, safe checks, and when a technician is needed.
On a Sub-Zero Built-In (BI) series unit, error code 10 1 00 means the refrigerator cabinet thermistor is reading as an open circuit. The thermistor is the temperature sensor the control uses to know how cold the fresh-food compartment is; when it reads open, the control cannot trust that temperature input.
This is a sensor-circuit fault, not a refrigerant problem. The control's recommended path is to check the thermistor's resistance (ohms) and verify it against the actual temperature, along with inspecting its wiring and connector. Because this requires meter testing and access to internal components, it is generally a technician-level diagnosis.
What 10 1 00 means
A thermistor changes electrical resistance as temperature changes, and the control reads that resistance to determine compartment temperature. An open reading means the circuit is broken, the control sees effectively infinite resistance from the refrigerator cabinet sensor. That can be the thermistor itself failing open, a disconnected or corroded connector, or a broken wire in the harness. With no valid temperature signal, the refrigerator cannot regulate properly.
Severity:Service recommended
Frequently asked
10 1 00 FAQ
What does Sub-Zero error code 10 1 00 mean?
A thermistor changes electrical resistance as temperature changes, and the control reads that resistance to determine compartment temperature. An open reading means the circuit is broken, the control sees effectively infinite resistance from the refrigerator cabinet sensor. That can be the thermistor itself failing open, a disconnected or corroded connector, or a broken wire in the harness. With no valid temperature signal, the refrigerator cannot regulate properly.
Can I fix Sub-Zero 10 1 00 myself?
You can safely try: Power cycle the unit at the control panel or breaker; a transient glitch can sometimes clear, though a true open will return.; Note whether the refrigerator temperature seems off, which helps the technician confirm whether the sensor or the control is at fault.; Avoid opening internal panels or pulling on wiring yourself; thermistor access and connector inspection are best left to a technician.. Confirming an open thermistor requires measuring its resistance with a meter and comparing the reading to a temperature/ohms chart, then tracing the harness and connector. Replacing the sensor or repairing wiring involves accessing internal components and verifying the control input, which is technician-level work.
How urgent is Sub-Zero 10 1 00?
10 1 00 is service recommended. Moderate urgency. The unit often keeps running, but the underlying cause should be diagnosed soon to avoid losing cooling or food.
How do I clear or reset Sub-Zero 10 1 00?
Some Sub-Zero codes clear once the cause is fixed or after a one-minute power cycle at the breaker; others stay until repaired. If 10 1 00 returns after a reset, the fault is still present — see how to reset a Sub-Zero control panel, or book a technician.
Which part does Sub-Zero 10 1 00 usually involve?
Confirming an open thermistor requires measuring its resistance with a meter and comparing the reading to a temperature/ohms chart, then tracing the harness and connector. Replacing the sensor or repairing wiring involves accessing internal components and verifying the control input, which is technician-level work.
What does it cost to fix Sub-Zero 10 1 00?
The diagnostic/service call is a flat $89, and every repair is backed by a 365-day warranty on parts and labor. You get a clear quote before any work — call (650) 668-1554 or book online.
Common causes
- Failed refrigerator cabinet thermistor (internally open)
- Loose, corroded, or disconnected thermistor connector
- Broken or chafed wire in the thermistor harness
- Moisture intrusion or corrosion at the sensor connection
- Control board input fault on the thermistor circuit (less common)
What you can check yourself
- Power cycle the unit at the control panel or breaker; a transient glitch can sometimes clear, though a true open will return.
- Note whether the refrigerator temperature seems off, which helps the technician confirm whether the sensor or the control is at fault.
- Avoid opening internal panels or pulling on wiring yourself; thermistor access and connector inspection are best left to a technician.
When to book a pro
Confirming an open thermistor requires measuring its resistance with a meter and comparing the reading to a temperature/ohms chart, then tracing the harness and connector. Replacing the sensor or repairing wiring involves accessing internal components and verifying the control input, which is technician-level work.
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