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Error code reference

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

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

U-Line codesU-Line ice maker codes

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

First step from the service manual

If excessive frost is noted, inspect door and door gasket for proper seal and alignment.

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

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What R Temp Hi 6H+ means on a U-Line ice maker

The R Temp Hi 6H+ error code on a U-Line ice maker indicates that the right zone temperature has climbed to more than 10 degrees Fahrenheit above the programmed set point and has remained there for over six consecutive hours. This is a sustained thermal fault, meaning the unit has failed to maintain its target temperature for an extended period rather than experiencing a brief spike. The right zone typically refers to the refrigerated or ice storage compartment, depending on the model configuration, and the 6-hour threshold is built in to distinguish a genuine cooling failure from a temporary recovery after door openings or heavy loading.

The most common entry point for this diagnostic is checking for excessive frost accumulation, which can indicate warm, humid air is entering the cabinet. A compromised door gasket or a door that is misaligned will allow ambient air infiltration, raising interior temperatures and causing the refrigeration system to work beyond its capacity. Over time, frost buildup on evaporator surfaces insulates the coil, reducing heat transfer efficiency and compounding the temperature rise.

Beyond door seal issues, the fault can stem from refrigeration system problems including a low refrigerant charge, a failing condenser fan motor, dirty condenser coils restricting airflow, or a defective evaporator fan. A malfunctioning thermistor in the right zone could also report falsely elevated temperatures, triggering the code even when actual cabinet conditions are acceptable. Systematic diagnosis should move from the simplest mechanical checks to refrigerant circuit evaluation.

Source: manufacturer service documentation.

Common causes of R Temp Hi 6H+

  1. 01

    Faulty or misaligned door gasket

    Part replacement

    A worn, torn, or poorly seated door gasket allows warm ambient air into the cabinet, raising the right zone temperature continuously. Inspect the gasket for visible gaps, tears, or areas that do not make firm contact with the cabinet frame.

  2. 02

    Door misalignment

    Wiring / connection

    If the door is not hanging level or is obstructed from closing fully, the seal will be inconsistent even with an intact gasket. Check hinge hardware and ensure nothing is blocking the door from closing completely.

  3. 03

    Frost-blocked evaporator

    Wiring / connection

    Excessive frost accumulation on the evaporator coil insulates it and prevents proper heat exchange, reducing cooling capacity in the right zone. Look for unusually heavy frost buildup inside the cabinet as a sign of this issue.

  4. 04

    Dirty or obstructed condenser coils

    Wiring / connection

    Dust and debris on the condenser coils reduce the unit's ability to reject heat, causing the compressor to work harder and the cabinet temperature to rise over time. Clean the condenser coils and verify adequate clearance around the unit for ventilation.

  5. 05

    Defective right zone thermistor

    Part replacement

    A failing temperature sensor in the right zone may report inaccurate readings that are higher than actual conditions, triggering the error code without a true cooling failure. This requires testing the thermistor's resistance values against the expected specification for the model.

See the test procedure for each cause

Frequently asked questions about R Temp Hi 6H+

What does R Temp Hi 6H+ mean on a U-Line ice_maker?
R Temp Hi 6H+ means the right zone of your U-Line ice maker has been measuring more than 10 degrees above its set point temperature for over six hours continuously. The unit detected a sustained inability to cool the right compartment to the target level. This is a protective alert designed to notify you of a cooling failure that has persisted long enough to affect ice production and food safety.
How do I fix the R Temp Hi 6H+ error on my U-Line ice maker?
Start by inspecting the door and door gasket for proper alignment and a tight seal, as air infiltration is the most common cause of this fault. If you notice heavy frost buildup inside the unit, allow it to defrost fully and check whether the error returns. If the door and gasket are in good condition, the next steps include cleaning the condenser coils, checking fan motors for operation, and testing the right zone thermistor. Persistent faults after these checks may indicate a refrigerant or compressor issue requiring a certified technician.
Will resetting the unit clear the R Temp Hi 6H+ error?
A power reset may temporarily clear the displayed error, but the code will return if the underlying cause has not been addressed. Because the fault requires six or more hours of elevated temperature to trigger, simply resetting the unit without correcting the root problem will result in the error reappearing. Always resolve the cause of the temperature rise before relying on a reset to confirm the repair.
Is the R Temp Hi 6H+ error on a U-Line ice maker a safety concern?
Yes, sustained elevated temperatures in the right zone can compromise the quality and safety of stored ice and any perishable items kept in that compartment. A temperature that is more than 10 degrees above the set point for over six hours indicates the zone is not being adequately refrigerated. You should address the fault promptly and discard any ice or food that may have been exposed to unsafe temperatures during the event.
How much does it cost to repair a U-Line ice maker showing R Temp Hi 6H+?
Repair costs vary widely depending on the cause. Replacing a door gasket is generally the least expensive fix, typically ranging from around $30 to $100 for parts plus labor. Thermistor or fan motor replacements can range from $75 to $250 including parts and labor. If the issue involves the refrigerant circuit or compressor, costs can range from $200 to $600 or more depending on the extent of the repair and local labor rates.

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