Samsung Refrigerator Error Code AUTO FILL Infuser Overflow Error

This error means the overflow sensor inside the AutoFill water pitcher has detected that water exceeded the safe fill level in the pitcher infuser compartment. The refrigerator stops the fill process automatically when this condition is sensed. A technician can confirm whether a true overflow occurred by measuring the voltage at main PCB connector CN90 between pins 11 and 13, where a reading of 0V to 4.5V confirms an active overflow detection.

The error itself is a protective function designed to stop water from continuously overflowing, so the refrigerator is working as intended by halting the fill cycle. However, water that has already overflowed inside the unit can cause secondary issues such as damage to shelving, the interior liner, or nearby electrical components if not cleaned up promptly. Address the standing water and resolve the root cause as soon as possible to avoid further damage.

Repair cost depends on which component is at fault. Wiring repairs or cleaning up a one-time overflow condition are generally low-cost fixes, often just a service call fee in the range of $75 to $150. Replacing the water inlet valve or overflow sensor typically adds $50 to $150 in parts on top of labor. A main PCB replacement is the most expensive scenario, with parts and labor potentially ranging from $200 to $450 or more depending on the specific model.

Start by removing the AutoFill pitcher and inspecting the infuser compartment for standing water, then dry the area completely. Check the voltage at CN90 pins 11 and 13 on the main PCB to determine whether the sensor is actively detecting overflow or reporting falsely. If a true overflow occurred, the water inlet valve should be inspected for proper shutoff function. A faulty sensor, damaged wiring harness, or defective main PCB may require component replacement if the voltage reading and physical inspection point to those failures.

A reset may temporarily clear the error code, but if the underlying cause is not corrected, the error will return the next time the AutoFill system attempts to fill the pitcher. If the cause was a one-time overfill event that has been cleaned up, the error may not return after a reset. Persistent or recurring errors require proper diagnosis of the inlet valve, overflow sensor, wiring, and main PCB before the system can be trusted to operate correctly.