Nor-Lake Walk-In Error Code dt2: Display Aux2 Sensor Alarm
Dt2 on a Nor-Lake Split-Pak walk-in with a LogiTemp or KE2 Evap controller means the Aux 2 temperature sensor on the combo display is shorted or open. The manual points to its Troubleshooting Tables for actions.
Medium: the main cooling is expected to continue, but the Aux 2 reading and alarms are lost.
- Code
- Dt2
- Maker
- Nor-Lake
- Equipment
- Walk-in coolers & freezers
- Applies to
- LogiTemp / KE2 Evap OEM controller on Nor-Lake Split-Pak refrigeration systems (A1 refrigerants)
What does Nor-Lake error code Dt2 mean?
Dt2 is the Disp Aux2 Sensor Alarm in the Alarms and Notifications list of the LogiTemp electronic controller system for Nor-Lake Split-Pak refrigeration systems. The combo display has several auxiliary temperature inputs. Aux 2 is one of them, and it takes a sensor that gives an extra temperature reading, such as a monitor point. The controller checks the sensor, and if the circuit is shorted or open it raises dt2 with the scrolling text DISPLAY AUX2 SENSOR. The manual's list gives only the abbreviation, scrolling text and meaning. The corrective actions are in the Troubleshooting Tables from page 52. This page does not quote those tables, because we do not hold their text. What follows from the entry is limited: the Aux 2 sensor circuit is not giving a valid reading, and whatever the controller does with Aux 2 is not working.
Affected models and control systems
Dt2 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. It refers to the Aux 2 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
- Dt2 or DISPLAY AUX2 SENSOR on the display
- Aux 2 temperature reading missing
- Monitor alarms tied to Aux 2 not working
Possible causes
Likely causes — what usually sits behind error code Dt2 on this control. A technician confirms which one it is before any part is replaced.
- Aux 2 sensor lead disconnected at the display terminal
- Sensor cable crushed behind a shelf or panel
- Sensor probe failed after moisture entry
Safe checks before calling for service
- Check the box temperature on the main display.
- Look for other alarms on the combo display.
- Do not pull sensor leads or open the display.
- Note whether the Aux 2 reading shows dashes or a number.
- Write down dt2 and the scrolling text for the technician.
How a technician diagnoses error code Dt2
- Read the alarm and identify where the Aux 2 sensor is placed.
- Check its wiring to the combo display.
- Measure resistance of the sensor against its chart.
- Check how Aux 2 is configured in the controller.
- Replace the sensor if it tests open or shorted.
- Look up the manual's Troubleshooting Tables entry.
- Reaching the display terminals means working near controller power.
- Aux sensor assignments are set in the service menu.
- The correct replacement sensor type must match the controller.
How error code Dt2 differs from similar codes
Dt2 and dt3 are the same kind of alarm for different auxiliary inputs, while dtS is the door sensor on Aux 1.
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.
Related Nor-Lake walk-in cooler & freezer error codes
Is the walk-in still cooling with dt2?
Probably, since dt2 is about an auxiliary sensor, but check the box temperature.
Will dt2 clear on its own?
Only if the sensor circuit recovers.
How is dt2 different from Hd2?
dt2 means the Aux 2 sensor circuit is shorted or open. Hd2 is a high temperature alarm on monitor 2.
Need help with Nor-Lake error code Dt2?
A technician confirms the cause on site and gives you the price in writing before any work starts.