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Error code reference

U-Line Ice Maker Error Code L Temp Hi 6H+

Left zone temperature is +10° over set point for over 6 hours.

U-Line codesU-Line ice maker codes

Left zone temperature is +10° over 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 Temp Hi 6H+ means on a U-Line ice maker

The L Temp Hi 6H+ error code on a U-Line ice maker indicates that the temperature in the left zone has been running at least 10 degrees Fahrenheit above the user-configured set point continuously for more than six hours. This is a sustained thermal fault, meaning the unit has had an extended period where it cannot maintain the desired cooling target. The left zone temperature sensor is actively monitoring this condition and triggers the alert once both thresholds, the 10-degree deviation and the 6-hour duration, are met simultaneously.

This type of prolonged temperature elevation typically points to a problem with either heat infiltration from the environment or a loss of cooling capacity within the refrigeration circuit. Common culprits include a door that is not closing fully or whose gasket has degraded, allowing warm ambient air to continuously enter the compartment. Refrigeration system issues such as low refrigerant charge, a failing evaporator fan, or a condenser that is clogged with debris can also reduce the unit's ability to recover temperature after a load event.

Because the fault requires six hours of sustained elevated temperature to trigger, it is less likely to be caused by a brief door opening or short-term ambient spike. The persistence of the condition is the key diagnostic indicator. Verifying proper door seal and closure is the recommended first step, as this is the most accessible and frequently overlooked cause. If the error persists after confirming the door is sealing correctly, the refrigeration system and its components require further inspection by a qualified technician.

Source: manufacturer service documentation.

Common causes of L Temp Hi 6H+

  1. 01

    Door not fully closed or poor gasket seal

    Wiring / connection

    A door left ajar or a worn, cracked, or dirty door gasket allows warm ambient air to continuously enter the left zone, overwhelming the cooling system. Inspect the gasket around its entire perimeter for tears, stiffness, or gaps, and confirm the door latches fully when pushed shut.

  2. 02

    Dirty or blocked condenser

    Wiring / connection

    Dust and debris accumulation on the condenser coils reduces the unit's ability to reject heat, causing temperatures to rise above set point over time. Inspect the condenser and clean it if buildup is present.

  3. 03

    Evaporator fan failure

    Part replacement

    If the evaporator fan motor has stopped running or is running intermittently, cold air will not circulate properly through the left zone, causing a sustained temperature rise. Listen for fan operation and check that airflow can be felt inside the compartment.

  4. 04

    Low refrigerant charge or refrigeration system fault

    Part replacement

    A refrigerant leak or a failing compressor will reduce cooling capacity, making it impossible for the unit to maintain set point temperatures over an extended period. This requires a certified technician with proper equipment to diagnose and repair.

  5. 05

    Left zone temperature sensor fault

    Part replacement

    A faulty or out-of-calibration temperature sensor in the left zone may be reporting inaccurate readings, triggering the error even when actual temperatures are within range. This diagnosis typically requires reading sensor output values and comparing them to actual compartment temperature.

See the test procedure for each cause

Frequently asked questions about L Temp Hi 6H+

What does L Temp Hi 6H+ mean on a U-Line ice_maker?
The L Temp Hi 6H+ code means the left zone temperature has been 10 degrees or more above the configured set point for over 6 consecutive hours. The unit's temperature monitoring system triggers this alert when cooling cannot be maintained for that extended duration. It signals a problem with heat infiltration, cooling capacity, or potentially the temperature sensor itself. Addressing the root cause promptly helps prevent ice quality issues and potential food safety concerns.
How do I fix the L Temp Hi 6H+ error on my U-Line ice maker?
Start by checking that the door closes fully and that the door gasket is clean and sealing tightly against the cabinet with no gaps or tears. Make sure the condenser area is free of dust and debris restricting airflow. If the error persists after these checks, contact U-Line customer care, as a technician will need to inspect the refrigeration system components such as the evaporator fan, compressor, and refrigerant charge.
Will resetting the unit clear the L Temp Hi 6H+ error?
Resetting the unit may temporarily clear the displayed error code, but it will not resolve the underlying cause. If the left zone continues to run more than 10 degrees above set point, the error will return after another 6-hour period. A reset is only a lasting fix if the root cause, such as a door left open, has already been corrected before the reset is performed.
Is the L Temp Hi 6H+ error a safety concern?
Yes, a sustained temperature rise of 10 degrees or more above set point for over 6 hours can affect ice quality and potentially the safety of any perishable items stored in the unit. It is important to address this error promptly rather than simply resetting it and continuing normal use. If the compartment temperature has risen significantly, inspect stored contents and discard anything that may have been compromised.
How much does it cost to repair the L Temp Hi 6H+ error on a U-Line ice maker?
Repair costs vary widely depending on the cause. Simple fixes like cleaning the condenser or adjusting the door gasket may cost little to nothing beyond a service call fee, which typically ranges from $75 to $150. Replacing a door gasket or evaporator fan motor generally falls in the $150 to $350 range including parts and labor. Refrigeration system repairs involving refrigerant or compressor work can range from $300 to $600 or more depending on the extent of the fault.

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