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Error code reference

U-Line Freezer Error Codes

12 error codes documented with diagnostic procedures.

Have your model number? Get codes specific to your unit.
(L) (R) Door Open 5MLeft or right door switch open for more than 5 minutes.(L) (R) Evap T OpenLeft or right evaporator thermistor circuit open.(L) (R) Evap T ShortLeft or right evaporator thermistor circuit shorted.(L) (R) Temp Hi 12H+Left or right zone temperature +10°F (+5°C) over set point for over 12 hours.(L) (R) Temp Hi 6H+Left or right zone temperature +10°F (+5°C) over set point for over 6 hours.(L) (R) Temp Lo 12H+Left or right zone temperature -10°F (-5°C) under set point for over 12 hours.(L) (R) Temp Lo 6H+Left or right zone temperature -10°F (-5°C) under set point for over 6 hours.(L) (R) Zone T OpenLeft or right zone thermistor circuit open.(L) (R) Zone T ShortLeft or right zone thermistor circuit shorted.Amb Thrm OpenAmbient thermistor circuit open.Amb Thrm ShortAmbient thermistor circuit shorted.No CommUnit lost communication to the display.

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Step-by-step tests, expected values, wiring diagram references, and verified part numbers.

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More U-Line error codes

Common questions

How do I find the error code on my U-Line Freezer?
Most U-Line freezers show the code directly on the control panel display. If your model has no display, it can be read by entering diagnostic mode with the key sequence for your model. The full procedures include model-specific instructions for reading codes.
Are these codes specific to my model?
The codes here apply broadly to U-Line freezers. Meanings and diagnostic steps can vary by model and production year, so enter your model number for model-specific information and procedures.
What do I do if my code is not listed?
Some codes are model-specific or only appear in diagnostic mode. Enter your model number to get codes specific to your unit, or contact us. We update the database continuously from manufacturer service documentation.
How much does it cost to access the full diagnostic procedures?
A 3-day pass is $9.95 one-time and gives full access to all brands, codes, and procedures. Monthly access is $29/month with unlimited access to everything including Max AI diagnostics.