Frigidaire Refrigerator Error Code I/M-SENSOR

The I/M-SENSOR code indicates an ice maker sensor error, meaning the main control board is detecting a problem with the ice maker thermistor circuit. The fault occurs when the sensor voltage at the PCB falls outside the 1.0V to 4.5V operating range, which can result from an open circuit, a short circuit, a connector failure, or an actual temperature extreme above 122°F or below -58°F. The ice maker will typically stop functioning normally until the fault is resolved.

This error is not a safety hazard to your home or family. It is isolated to the ice maker sensor circuit and does not affect the main fresh food or freezer cooling functions. However, leaving it unresolved means your ice maker will not operate reliably, and in some cases the ice maker may stop producing ice entirely.

A power reset may temporarily clear the error code display, but the code will return if the underlying fault in the sensor circuit is still present. Resetting without repairing is useful only for confirming whether a fault is intermittent or persistent. A permanent fix requires diagnosing and correcting the root cause, whether that is a bad thermistor, damaged wiring, a faulty connector, or a failed control board.

Some causes of this error are DIY-friendly. Reseating a loose sensor connector, cleaning corroded terminals, and inspecting the wiring harness for visible damage are tasks most homeowners can attempt safely with the refrigerator unplugged. Replacing the thermistor or main PCB requires more comfort with appliance disassembly and electrical testing, so those steps are better suited for technicians if you are not confident with a multimeter.

Repair costs vary depending on the failed component. A replacement ice maker thermistor typically costs between $15 and $50 for the part alone. If the main PCB requires replacement, parts can range from $100 to $300 or more. Adding professional labor, total repair costs generally fall between $100 and $400 depending on what is at fault and your location.