LG Refrigerator Error Code I/M FUNCTION ERROR

The I/M FUNCTION ERROR on an LG refrigerator indicates a fault within the ice maker assembly specific to dispenser-equipped models. The control system monitors two key conditions during ice maker operation: horizontal leveling of the unit (bad horizontality) and proper positioning or movement of the ice tray mechanism. When either of these conditions is detected as faulty more than twice during a single cycle or across multiple checks, the control board logs and displays this error code. The ice maker kit includes sensors and mechanical components that report positional data back to the main control, and repeated failures in that feedback loop trigger the error.

The most direct cause is a failed or malfunctioning ice maker assembly. The internal components responsible for detecting tray position and unit levelness are integrated into the ice maker kit itself. If the tray motor, position sensor, or the mechanical linkage inside the assembly is defective, the control board will receive out-of-range or absent signals and flag the error. Physical misalignment of the refrigerator, causing it to sit unlevel on the floor, can also contribute to the horizontality fault condition.

Because this error involves conditions detected more than twice for each monitored item, it is not typically caused by a brief anomaly or power fluctuation. The error reflects a persistent, repeatable failure in the ice maker's self-check routine. LG's primary diagnostic direction is to replace the ice maker assembly and then restore power to confirm normal operation. Before replacing any parts, verifying that the refrigerator itself is sitting level on a flat surface is a worthwhile first check.