Samsung Refrigerator Error Code I/M-SENSOR (F)

The I/M-SENSOR (F) code means the main PCB has detected a fault with the ice maker temperature sensor on the freezer side of a Twin Ice Maker unit. The fault can be an open circuit, a short circuit, a connector failure, or a temperature reading outside the valid range of -58°F to 122°F. The control board monitors sensor voltage between 1.0V and 4.5V, and any reading outside that window triggers this error. Ice maker operation is typically suspended until the fault is resolved.

The refrigerator's cooling function is separate from the ice maker, so food stored in the fridge and freezer compartments is generally not at immediate risk. However, ice production will likely be suspended or unreliable while the fault is active. It is advisable to address the error promptly, since an undetected temperature issue in the freezer section could indicate a broader cooling problem.

If the repair requires only a replacement thermistor, parts costs are typically in the range of $15 to $50, and the job is relatively straightforward. A wiring harness repair or replacement may add $20 to $80 in parts depending on the specific harness involved. If the main PCB is at fault, parts alone can range from $100 to $300 or more, with additional labor costs if a technician is hired. Total repair costs including professional labor generally fall between $100 and $400 depending on the root cause.

A knowledgeable DIYer can perform initial diagnostics such as inspecting the sensor connector for corrosion or loose pins, and checking continuity along the wiring harness. Measuring voltage at the main PCB sensor connector requires a multimeter and basic electrical knowledge. If the thermistor itself has failed, replacing it is a straightforward parts swap for someone comfortable working inside a freezer compartment. Main PCB replacement is more complex and may be better suited to a professional technician.

A reset may temporarily clear the code from the display, but if the underlying fault in the sensor, wiring, or connector has not been repaired, the error will return. Resetting is useful for confirming whether the code was caused by a temporary temperature spike versus a persistent hardware failure. Do not rely on resets as a fix without completing the voltage and continuity diagnostics first.