All U-Line error codes

U-Line Freezer Error Codes

12 error codes for U-Line freezer models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

(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.

MyPros+ Max

Get the full diagnostic procedure for any U-Line freezer error code.

Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts
Verified part numbers when replacement is required

$29/month · Cancel anytime · Or $9.95 3-day pass

M+

M+ Max·U-Line Freezer

(L) (R) Door Open 5M on my U-Line Freezer

M+

Left or right door switch open for more than 5

From Service Manual 391479, p.51:

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

2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.

3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.

Part W10810403

Door lock assembly

Start diagnosing faster today.

$29/month · Cancel anytime · Or $9.95 3-day pass