LG Refrigerator Error Code ICE MAKER SENSOR ERROR

This error means the refrigerator's control board has detected a problem with the temperature sensor in the ice maker. The sensor circuit, monitored through Main PCB connector CN90 pins 3 and 4, is producing a voltage outside the expected 4.5V to 1.0V range. The cause can be a dislodged sensor housing, damaged wiring, a faulty connector, or a defective thermistor. Ice production will typically stop until the fault is corrected.

The error affects only the ice maker circuit and does not directly impact the refrigerator or freezer cooling sections. Food storage should remain safe as long as the refrigerator and freezer compartments are maintaining proper temperatures. However, the ice maker will likely be disabled, so you should not expect ice production until the fault is resolved.

A power reset may temporarily clear the error code, but the fault will return if the underlying problem with the sensor circuit has not been fixed. Resetting is useful for confirming whether the issue is intermittent or persistent, but it is not a repair. If the code reappears after the refrigerator restarts, the sensor, wiring, or connector must be inspected and corrected before the error will stay clear.

Some causes are accessible to a knowledgeable DIYer. Re-seating a slipped sensor housing or re-connecting a loose plug requires no special tools and no replacement parts. Testing voltage at CN90 pins 3 and 4 requires a multimeter and comfort working around live appliance circuits. Replacing a wiring harness or thermistor is a moderate repair that most DIYers with basic electrical skills can complete, though Main PCB replacement is typically better left to a technician.

Repair cost depends heavily on the root cause. A simple re-seat of the sensor housing costs nothing. Replacing the ice maker thermistor typically runs between $20 and $60 for the part, plus labor if a technician is involved. A wiring harness repair or replacement may cost $30 to $100 in parts. Main PCB replacement, if required, is the most expensive outcome, generally ranging from $150 to $400 or more depending on the model, not including labor charges.