Samsung Refrigerator Error Code Freezer 2nd digit b

This code indicates a freezer sensor error, meaning the main PCB is receiving an abnormal reading from the freezer thermistor. The fault can be caused by a disconnected or slipped connector, a cut or shorted wire, or a thermistor that has failed. The sensor must report a temperature within the valid range, and readings at +50°C or above, or -50°C or below, will trigger this code. Diagnosis starts by checking the voltage at main PCB connector CN30 between pins 1 and 6, which should read between 1.0V and 4.5V.

The refrigerator may continue to run while this error is active, but without a functioning freezer sensor the control board cannot accurately regulate freezer temperature. This puts frozen food at risk of spoiling or of the freezer running too cold. It is best to check and repair the sensor circuit promptly rather than continue operating with this fault active.

A reset may temporarily clear the error code from the display, but if the underlying sensor fault is still present the code will return. The voltage at CN30 pins 1 and 6 must fall within the 1.0V to 4.5V range for the system to operate normally without retriggering the fault. A reset is useful for confirming whether a loose connector fix resolved the issue, but it is not a substitute for properly diagnosing and repairing the sensor circuit.

If the cause is simply a loose connector at CN30 on the main PCB, reseating it is a straightforward repair that a confident DIYer can handle. However, if the wiring harness is cut or shorted, or if the thermistor has failed, the repair requires accessing internal components and using a multimeter to confirm voltages and resistance values. Technicians with basic electrical diagnostic skills can perform this repair, but those unfamiliar with appliance wiring should consider professional service.

If only a connector needs to be reseated, there may be no parts cost at all, just the cost of a service call if you use a technician. A replacement freezer thermistor typically costs somewhere in the range of $15 to $50 for the part alone. If the wiring harness needs replacement, parts and labor combined could range from $100 to $250 or more depending on the model and service provider.