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Error code reference

U-Line Freezer Error Code (L) (R) Temp Lo 6H+

Left or right zone temperature -10°F (-5°C) under set point for over 6 hours.

U-Line codesU-Line freezer codes

Left or right zone temperature -10°F (-5°C) under set point for over 6 hours.

First step from the service manual

Verify door is closed and sealing. Contact Customer Care if persistent.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What (L) (R) Temp Lo 6H+ means on a U-Line freezer

The (L) (R) Temp Lo 6H+ error code on a U-Line freezer indicates that the temperature in the left or right zone has remained at least 10°F (5°C) below the configured set point continuously for more than 6 hours. The 6-hour threshold is a deliberate design choice to avoid nuisance alerts from brief temperature fluctuations during normal operation. When this condition persists past that window, the unit flags it as a sustained fault requiring investigation. The "L" or "R" designation tells you which specific zone is affected, which is particularly useful on dual-zone U-Line models.

This type of low-temperature alarm points to a refrigeration system or airflow issue that is causing excessive cooling rather than insufficient cooling. Common culprits include a malfunctioning temperature sensor reporting incorrect readings, a stuck-open or improperly calibrated expansion device, a faulty temperature control board sending continuous cooling commands, or airflow restrictions causing one zone to overcool while another underperforms. In dual-zone configurations, a damper or zone divider fault can also redirect more cold air than intended into one compartment.

The first diagnostic step is straightforward: confirm the door for the affected zone is fully closed and that the door gasket is sealing properly. A door left ajar does not typically cause overcooling, but it rules out any confusion between user error and a genuine refrigeration fault. If the error persists after confirming the door seal, the issue likely lies with the temperature sensing circuit or the cooling control system, and contacting U-Line Customer Care is recommended for further guidance and potential service dispatch.

Source: manufacturer service documentation.

Common causes of (L) (R) Temp Lo 6H+

  1. 01

    Faulty Temperature Sensor

    Part replacement

    A defective temperature sensor in the affected zone can report an inaccurately high temperature reading, causing the control board to run the compressor longer than needed and driving the actual zone temperature far below the set point. Check for corroded sensor connectors or a sensor that has shifted out of its mounting position.

  2. 02

    Control Board Malfunction

    Part replacement

    If the electronic control board is not properly regulating cooling cycles, it may command continuous or near-continuous cooling for one zone, pushing temperatures well below the set point. A board fault can often be accompanied by other erratic behavior or error codes.

  3. 03

    Damper or Zone Divider Issue

    Wiring / connection

    On dual-zone U-Line models, a damper that is stuck open can allow more cold air than intended to flow into one zone, causing that zone to overcool consistently. Inspect the damper for ice buildup or mechanical obstruction that prevents it from closing properly.

  4. 04

    Expansion Device Stuck Open

    Part replacement

    A stuck-open or improperly functioning expansion device in the refrigeration circuit can allow excessive refrigerant flow, resulting in overcooling of the evaporator and one or both zones. This is a less common cause but should be considered if sensor and board checks do not identify the problem.

  5. 05

    Door Not Fully Closed or Gasket Misaligned

    Wiring / connection

    While an open door more commonly causes warming, a gasket that is folded or misaligned can in some configurations disrupt airflow management and trigger sensor anomalies. Always confirm the door closes completely and the gasket seats evenly around the full perimeter before pursuing further diagnostics.

See the test procedure for each cause

Frequently asked questions about (L) (R) Temp Lo 6H+

What does (L) (R) Temp Lo 6H+ mean on a U-Line freezer?
This code means the left or right zone of your U-Line freezer has been running at least 10°F (5°C) below your set point temperature for more than 6 consecutive hours. The letter L or R identifies which zone is affected. It indicates the unit is overcooling in that zone, which typically points to a sensor, control board, or airflow issue rather than a simple door problem.
How do I fix the (L) (R) Temp Lo 6H+ error on my U-Line freezer?
Start by checking that the door on the affected zone is fully closed and the door gasket is sealing evenly all the way around. If the door and seal check out, the next steps involve inspecting the temperature sensor and its wiring connections in the flagged zone. If the error continues, U-Line Customer Care should be contacted for further diagnostic support, as the repair may require checking the control board or refrigeration components.
Will resetting my U-Line freezer clear the (L) (R) Temp Lo 6H+ error?
A power cycle or reset may temporarily clear the displayed error, but it will return if the underlying cause is not resolved. Because this code requires a sustained 6-hour overcooling condition to trigger, it will reappear if the sensor, control board, or airflow problem persists. Resetting is useful for confirming whether the fault is ongoing, but it is not a fix on its own.
Is my food safe when the (L) (R) Temp Lo 6H+ error is active?
Because this error indicates the zone is running colder than the set point rather than warmer, frozen food is generally not at immediate risk of spoiling. However, extremely low temperatures over extended periods can cause freezer burn or texture damage to some foods. It is still important to address the fault promptly to avoid additional stress on the refrigeration system and to keep temperatures within the intended range.
How much does it cost to repair a U-Line freezer showing the (L) (R) Temp Lo 6H+ error?
Repair costs vary depending on the root cause. If the fix is a straightforward door gasket replacement, costs typically range from around $20 to $80 for parts and minimal labor. A temperature sensor replacement generally falls in the $50 to $150 range including parts and labor. Control board replacement is more involved and can range from $200 to $500 or more depending on the model and service rates in your area.

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