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Error code reference

U-Line Refrigerator Error Code Temp Hi 12H+

Zone temperature is more than 10°F over set point for over 12 hours.

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What the Temp Hi 12H+ error code actually means

Your U-Line refrigerator has been running more than 10 degrees warmer than the temperature you set, and it has stayed that way for over 12 hours. This means the unit is struggling to cool properly, and any food inside may be at risk. You should check that the door is fully closed and call for service if the problem does not resolve quickly.

Diagnostic procedure

The full Temp Hi 12H+ procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Verify door is closed and sealing. Check condenser coil cleanliness, condenser fan operation, zone thermistor resistance, and thermistor connections. Contact Customer Care if persistent.
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Most common causes of Temp Hi 12H+

Ranked by how often they cause this code
  1. 1Dirty Condenser Coil
  2. 2Door Not Sealing Properly
  3. 3Condenser Fan Failure
  4. 4Faulty Zone Thermistor
  5. 5Loose or Corroded Thermistor Connections

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Questions people ask about Temp Hi 12H+

What does Temp Hi 12H+ mean on a U-Line refrigerator?
This error means the temperature in a specific zone of your U-Line refrigerator has been more than 10°F above your set point for over 12 consecutive hours. It is a sustained cooling failure alert designed to notify you before food safety becomes a serious concern. The cause can range from a dirty condenser coil to a failed fan or faulty thermistor. Immediate inspection is recommended to protect stored food.
Will resetting my U-Line refrigerator clear the Temp Hi 12H+ error?
A reset may temporarily clear the error display, but it will not resolve the underlying problem causing the high temperature condition. If the root cause is not corrected, such as a dirty condenser or a failed fan, the unit will continue to run warm and the error will return. Always diagnose and fix the cause before relying on a reset to clear the code.
How much does it cost to repair a U-Line refrigerator showing the Temp Hi 12H+ error?
Repair costs vary depending on the cause. If only cleaning the condenser coil is needed, the cost may be minimal. Replacing a door gasket or thermistor typically runs in the range of $75 to $200 including parts and labor, while a condenser fan motor replacement can range from $100 to $300 depending on service rates in your area. Diagnosing the specific failed component first is the best way to get an accurate cost estimate.
How do I fix the Temp Hi 12H+ error on my U-Line refrigerator?
Start by confirming the door is fully closed and the gasket is sealing properly around the entire perimeter. Next, inspect the condenser coil for dust buildup and clean it if needed, then verify the condenser fan is running. If those checks pass, test the zone thermistor and its wiring connections for faults. If the error persists after these steps, contact U-Line Customer Care for further assistance.
Is the Temp Hi 12H+ error a food safety concern?
Yes, this error should be taken seriously from a food safety perspective. The zone has been more than 10°F above the set temperature for over 12 hours, which is well into the range where perishable foods can begin to spoil. Check the actual internal temperature and consider moving temperature-sensitive items to another refrigerator until the unit is repaired.

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