Nor-Lake Walk-In Error Code dt3: Display Aux3 Sensor Alarm

What does Nor-Lake error code Dt3 mean?

Dt3 is the Disp Aux3 Sensor Alarm in the LogiTemp controller's Alarms and Notifications list for Nor-Lake Split-Pak refrigeration systems. The third auxiliary input of the combo display, Aux 3, takes a temperature sensor, and the controller treats a short or an open circuit on that input as a sensor failure. It then shows dt3 and the scrolling text DISPLAY AUX3 SENSOR. The entry in the list is brief: abbreviation, scrolling text and meaning. The manual leaves the corrective actions to its Troubleshooting Tables, which are not reproduced here. So the only things we can say are that the Aux 3 circuit gives no valid reading and that any alarm the controller derives from Aux 3, such as monitor 3 high or low, cannot work while the sensor is out.

Affected models and control systems

Dt3 is listed for the LogiTemp and KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems with A1 refrigerants, in the Alarms and Notifications list printed on pages 48-52, for the Aux 3 input of the combo display.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• Dt3 or DISPLAY AUX3 SENSOR on the display
• Aux 3 temperature reading missing
• No Hd3 or Ld3 alarms possible while the sensor is out

Possible causes

Likely causes — what usually sits behind error code Dt3 on this control. A technician confirms which one it is before any part is replaced.

• Aux 3 sensor wire pulled loose at the display
• Sensor lead cut where it passes through the box wall
• Sensor probe failed or wet

Safe checks before calling for service

How a technician diagnoses error code Dt3

1. Read the alarm and confirm it is the Aux 3 input.
2. Trace and check the sensor wiring.
3. Measure the sensor resistance against its chart.
4. Check the controller configuration of the Aux 3 input.
5. Replace the sensor if it fails.
6. Confirm dt3 clears and the reading returns.

How error code Dt3 differs from similar codes

Dt3 follows the same pattern as dt2, for the Aux 3 input instead of Aux 2.

Technical reference

Document

LogiTemp Electronic Controller System Operations Manual for Split-Pak Refrigeration Systems Containing A1 Refrigerants

Edition

171527 Rev. A, 2025 (Refrigerated Solutions Group)

Models / control

LogiTemp / KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems (A1 refrigerants)

Section

Alarms & Notifications List, printed pp. 48-52; Troubleshooting Tables from p. 52

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.