LG Refrigerator Error Code UU/UU

The UU/UU code indicates simultaneous over-cooling or insufficient cooling in both the upper and lower compartments of the refrigerator. It also signals that the overload protector (OLP) has activated, shutting down compressor operation as a safety measure. The fault points to a problem in the sealed refrigerant system, specifically the switch valve, capillary tube, or coolant valve. Both zones being affected at once means the issue is in a shared part of the refrigerant circuit.

The UU/UU code itself is not an immediate safety emergency for people in the home, but it does mean your food is at risk since neither compartment is cooling properly. The OLP activation is a safety mechanism protecting the compressor from damage due to overcurrent or overheating. You should remove perishable food from the refrigerator until the fault is resolved. Do not repeatedly reset the unit and allow it to run if the OLP keeps tripping, as this can cause compressor damage.

Repair costs for a UU/UU fault vary widely depending on what component has failed. A switch valve replacement, including parts and labor, typically falls in the range of $150 to $350. Sealed system repairs involving capillary tube blockages or refrigerant recharge can range from $200 to $600 or more depending on the extent of the work. If the compressor itself has been damaged due to OLP cycling, replacement costs can reach $400 to $800 or higher. Getting a diagnostic assessment before committing to repairs is recommended.

Some basic checks, like inspecting the switch valve terminal connections for looseness or corrosion, can be done without specialized tools. However, diagnosing a capillary tube clog or a failed switch valve requires pressure testing equipment and refrigerant handling certification. Most repairs that clear this code involve sealed system work and should be performed by a qualified technician. Attempting to open the sealed system without proper training can be dangerous and may void any remaining warranty.

A power reset may temporarily clear the displayed code, but it will not resolve the underlying cause of the fault. If the capillary tube is clogged, the switch valve is faulty, or the OLP is tripping due to a compressor issue, the error will return once the refrigerator attempts to run through a cooling cycle. Resetting repeatedly without diagnosing the root cause risks further damage to the compressor. A proper diagnosis of the sealed system is required for a lasting repair.