LG Refrigerator Error Code 16

Error code 16 on an LG refrigerator signals an abnormality in the defrost sensor for the F (freezer) compartment. The control board triggers this code when the sensor reports a temperature outside the valid detection range, meaning not lower than 122°F and not higher than -58°F. Common causes include a broken wire, short circuit, contact failure, missing sensor housing, or a defective sensor. The refrigerator may not defrost properly until the issue is corrected.

The refrigerator may continue to run, but a non-functioning defrost sensor means the defrost cycle cannot operate correctly. Over time this can lead to excessive frost buildup on the evaporator, reduced airflow, and declining cooling performance in both compartments. Food safety can become a concern if temperatures rise due to a blocked evaporator. It is best to address the error promptly rather than continuing to run the unit indefinitely.

A power reset may temporarily clear the error code display, but the code will return if the underlying problem with the defrost sensor or its wiring has not been corrected. Resetting the unit does not repair a broken wire, failed thermistor, or faulty connection. Use a reset only to confirm whether the fault is intermittent after a physical repair has been completed, not as a standalone fix.

A knowledgeable DIYer can often resolve this error by inspecting the defrost sensor wiring harness for visible damage, reseating the connector, and verifying the sensor housing is properly mounted. Testing the thermistor with a multimeter requires basic knowledge of resistance measurement and access to expected resistance values for the sensor. If the sensor itself has failed or the wiring is damaged, replacement parts will be needed and some disassembly of the freezer compartment lining may be required.

If the fix is simply reseating a loose connector, there may be no parts cost at all, only your time. Replacing a defrost sensor typically costs between $20 and $60 for the part depending on the specific model. If a professional technician is needed, expect to add a service call and labor fee ranging from $80 to $200 or more depending on your location and the complexity of accessing the sensor.