Samsung Refrigerator Error Code R-1 (R-Sensor segment)

The R-1 code indicates that the fresh food compartment temperature sensor is reporting a reading outside its valid range, specifically above 149°F (+65°C) or below -58°F (-50°C). The control board flags this as a sensor part error because those temperatures are not physically possible in normal operation. The fault is typically in the thermistor, the wiring harness connecting it to the board, or the board's connector pins. The circuit can be confirmed by measuring voltage at main PCB connector CN30 pin 6 to CN75 pin 1, which should read between 1.0V and 4.5V.

A power reset may temporarily clear the R-1 code from the display, but if the underlying sensor or wiring fault is still present, the error will return once the control board re-evaluates the sensor signal. Resetting should only be done after addressing the root cause to confirm the repair was successful. Using a reset to mask the error without fixing the fault means the fresh food compartment temperature will continue to be unmonitored and uncontrolled properly.

If only the thermistor needs replacement, parts typically range from $15 to $50 depending on the model, and the repair is straightforward enough for many DIYers. A professional diagnostic and sensor replacement visit may cost between $100 and $250 in total. If the main PCB is faulty, parts alone can range from $150 to $400 or more, and labor adds to that cost. Wiring harness repairs fall somewhere in between depending on the extent of the damage.

Homeowners comfortable with basic electrical checks can inspect the wiring harness for visible damage and reseat connector plugs, which sometimes resolves the error at no cost. Voltage testing at CN30#6 to CN75#1 requires a multimeter and some familiarity with reading live circuit values. If the thermistor needs replacement, it is a relatively accessible repair, though locating the correct sensor for your specific model and routing the harness correctly is important. Main PCB replacement is more complex and may be better handled by a qualified technician.

Operating the refrigerator with an active R-1 fault is not recommended for extended periods. Without a functioning fresh food sensor, the control board cannot accurately regulate cooling cycles, which can result in food temperatures rising into the unsafe zone above 40°F. Perishable foods should be monitored closely with a standalone thermometer or moved to another refrigerator until the fault is resolved.