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Error code reference

LG Freezer Error Code UU/UU

Over-cooling and weak-cooling in upper and lower part at the same time; insufficient cooling in upper and lower part; operation malfunction and OLP…

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What the UU/UU error code actually means

The UU/UU error means your LG freezer is having a cooling problem in both the upper and lower sections at the same time, which is preventing it from maintaining the right temperature anywhere inside. This is typically caused by a faulty valve or a blockage that controls how refrigerant moves through the freezer. A safety device inside the freezer may have also shut itself off to prevent further damage, so the unit needs to be inspected before it is restarted.

Diagnostic procedure

The full UU/UU procedure

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1
First diagnostic step
Check switch valve terminal location; check for capillary tube welding clog; check for improper coolant valve operation.
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Most common causes of UU/UU

Ranked by how often they cause this code
  1. 1Improper switch valve operation
  2. 2Capillary tube welding clog
  3. 3Switch valve terminal connection fault
  4. 4OLP (overload protector) activation
  5. 5Refrigerant system contamination or restriction

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Questions people ask about UU/UU

What does UU/UU mean on a LG freezer?
The UU/UU code on an LG freezer signals a simultaneous cooling malfunction in both the upper and lower compartments. The unit is detecting either over-cooling or insufficient cooling in both zones at the same time, which points to a problem with refrigerant flow or the switch valve that controls it. In many cases, the overload protector (OLP) will also activate as part of the system's safety response.
Is it safe to keep food in my LG freezer when the UU/UU code is showing?
When the UU/UU code is active, the freezer is not maintaining proper temperatures in either zone, which means food safety is at risk. You should check the actual internal temperature immediately and transfer frozen items to another freezer or use ice if the temperature has risen above safe levels. Do not assume the unit is still cold enough simply because it was recently working.
Will resetting my LG freezer clear the UU/UU error code?
A power reset may temporarily clear the UU/UU code from the display, but it will not resolve the underlying problem causing the cooling malfunction. If the switch valve, capillary tube, or overload protector is at fault, the error will return once the system attempts to regulate temperature again. A reset should only be performed after the root cause has been identified and corrected.
Can I fix the UU/UU error on my LG freezer myself?
Some initial checks, such as inspecting the switch valve terminal connections for loose or corroded contacts, can be performed by a knowledgeable DIYer. However, diagnosing a capillary tube clog or a failed switch valve typically requires specialized tools and refrigerant handling equipment. If the overload protector has activated, it is best to have a qualified technician assess the system before restarting the freezer to avoid compressor damage.
How much does it cost to repair a UU/UU error on an LG freezer?
Repair costs vary depending on the specific cause. A switch valve replacement, including parts and labor, typically falls in the range of $150 to $400. If the capillary tube requires repair or the refrigerant system needs evacuation and recharge, costs can range from $250 to $600 or more. Getting a diagnostic inspection first will help clarify which components need attention before committing to a repair.

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