Nor-Lake Walk-In Error Code dtS: Door Temp Sensor Alarm
DtS on a Nor-Lake Split-Pak walk-in with a LogiTemp or KE2 Evap controller means the door temperature sensor on the combo display is shorted or open. The manual refers to its Troubleshooting Tables for corrective actions, which are not reproduced here.
Medium: the walk-in is expected to keep cooling, but door temperature protection is not working.
- Code
- DtS
- 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 DtS mean?
DtS is the Door Temp 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 an auxiliary input, Aux 1, wired to a sensor that measures the temperature at the door. The controller checks that sensor continuously. If the sensor is shorted or open, it cannot give a valid reading, so the controller raises dtS. The list shows the abbreviation, the scrolling text, DOOR TEMP SENSOR, and a one-line description. The corrective actions are in a separate set of Troubleshooting Tables from page 52 of the manual, which this page does not quote. So what the manual says here is only the meaning. A door temperature sensor matters on a walk-in because it supports the door heater or door temperature alarms, and without it those checks may not work.
Affected models and control systems
DtS 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. The Aux 1 input is on 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
- DtS or the scrolling text DOOR TEMP SENSOR on the display
- Door temperature reading missing or odd
- Other door temperature alarms not working
Possible causes
Likely causes — what usually sits behind error code DtS on this control. A technician confirms which one it is before any part is replaced.
- Aux 1 sensor wire cut or pinched at the door frame
- Sensor connector at the combo display loose
- Sensor element failed from moisture
Safe checks before calling for service
- Look at the combo display for other alarms.
- Check the walk-in box temperature is normal.
- Do not disconnect the sensor or open the display.
- Open and close the door normally and see if the alarm changes.
- Write down the code and the scrolling text, and tell the technician.
How a technician diagnoses error code DtS
- Read the alarm and confirm it is the Aux 1 door sensor.
- Check the sensor wiring from the display to the door frame.
- Measure the sensor resistance against its chart.
- Check the sensor setup in the controller.
- Replace the sensor if open or shorted.
- Check the manual's Troubleshooting Tables for the listed action.
- The sensor wiring runs near door heater circuits at line voltage.
- Sensor configuration is set in the controller menus.
- Door heater controls may depend on this sensor.
How error code DtS differs from similar codes
DtS is a sensor failure. DtH and dtL on the same controller are alarms for the door temperature being above or below limit.
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
Can I use the walk-in with dtS?
Usually yes, since the box cooling does not depend on it, but door temperature checks may be off.
Will dtS clear by itself?
Only if the sensor connection recovers. Otherwise the sensor needs repair.
Is dtS the same as dtH?
No. DtS means the sensor is shorted or open. DtH means the door temperature is high.
Need help with Nor-Lake error code DtS?
A technician confirms the cause on site and gives you the price in writing before any work starts.