Samsung Refrigerator Error Code b

The "b" error code indicates a fault with the R-sensor, the temperature sensor located in the refrigerator compartment. The control board has detected a resistance reading consistent with an open or short circuit, equivalent to a sensed temperature below -50°C or above +65°C. This means the refrigerator cannot accurately monitor its internal temperature. The sensor, its wiring harness, or the connector at CN30 on the control board should be inspected and tested.

It is not advisable to rely on the refrigerator for food safety while the b error is active. Because the control board cannot read the compartment temperature, it may not cycle the compressor correctly, which means the interior could be warmer than expected without any visible indication. Perishable foods should be moved to another refrigerator until the fault is resolved.

A reset, such as unplugging the refrigerator for a few minutes, may temporarily clear the error code from the display. However, if the underlying fault with the R-sensor or its wiring is still present, the code will return once the control board runs its diagnostic check again. A reset is useful for confirming whether the fault is intermittent, but it is not a fix and does not address the root cause.

A knowledgeable DIYer with a multimeter can perform the initial diagnosis by checking resistance at connector CN30 between pins 2 and 5 and comparing the reading to the sensor specification. If the sensor itself has failed, replacing it is a straightforward repair involving unplugging the old sensor and plugging in a new one. However, if the fault is in the wiring harness or the control board, the repair becomes more involved and may benefit from professional service.

If only the R-sensor needs to be replaced, parts typically cost in the range of $15 to $50, and a technician's labor for this repair generally falls between $75 and $150 depending on your area. If the control board is the root cause, board replacement can raise the total repair cost to the $200 to $400 range or higher. Getting a diagnosis first before committing to parts is the most cost-effective approach.