Sub-Zero Refrigerator Error Code 10 C 00

Error code 10 C 00 on a Sub-Zero refrigerator indicates that the control board has detected an open circuit condition in the condenser thermistor. The condenser thermistor is a temperature-sensing resistor positioned near the condenser coil that continuously monitors condenser temperature and reports it to the main control board. When the circuit is open, the board receives no valid signal from the thermistor, triggering this fault code to alert the technician that the sensor loop is broken.

An open circuit in a thermistor circuit typically means the resistance has risen to an unmeasurable or infinite level, which is the opposite of a short circuit. To diagnose this, the thermistor should be disconnected and tested with a multimeter set to measure resistance (ohms). A functional thermistor will produce a resistance reading that corresponds to the ambient temperature at the condenser. An open thermistor will show no continuity or an out-of-range resistance reading. The wiring harness between the thermistor and the control board should also be inspected for breaks, corrosion, or loose connector pins that could interrupt the circuit.

If the thermistor itself tests faulty, replacement is required before the refrigerator can accurately regulate condenser cooling. Operating the unit without a functioning condenser thermistor may cause the system to run inefficiently, potentially leading to compressor stress or inadequate cooling performance. Clearing the fault code without addressing the underlying component failure will not resolve the issue.