Nor-Lake Walk-In Error Code dtL: Low Door Temp Alarm
DtL on a Nor-Lake Split-Pak walk-in with a LogiTemp or KE2 Evap controller means the door temperature has been below its setpoint minus offset for longer than the alarm delay. A cold door can ice up, so check the frame and heater. The manual's Troubleshooting Tables give the corrective actions.
Medium: the walk-in may still cool, but ice at the door can damage the gasket and prevent sealing.
- Code
- DtL
- 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 DtL mean?
DtL is the Low Door Temp Alarm on the LogiTemp electronic controller used with Nor-Lake Split-Pak refrigeration systems. The door sensor reading is compared with the door setpoint minus an offset. When it stays below that level for longer than the alarm delay, the controller shows dtL and the scrolling text DOOR TEMP LOW. The manual's list gives this meaning but no causes or steps; corrective actions sit in the Troubleshooting Tables from page 52, which we do not quote. A door that is too cold is a concern in a freezer or cooler because moisture freezes at the frame, the door can stick, and the gasket can tear. Whether the cause is a door heater that is not working or a sensor that reads too low is something the list does not say.
Affected models and control systems
DtL 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. Setpoint, offset and delay are set in the controller.
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
- DtL or DOOR TEMP LOW on the display
- Ice forming at the door frame or gasket
- Door sticking when opened
Possible causes
Likely causes — what usually sits behind error code DtL on this control. A technician confirms which one it is before any part is replaced.
- Door temperature below its setpoint minus offset for longer than the alarm delay
- Door heater not working, so the frame gets too cold
- Door sensor reading lower than the real temperature
- Setpoint or offset changed to a value the door cannot meet
Safe checks before calling for service
- Look at the door frame and gasket for ice.
- Do not pry at ice with tools that could cut the gasket.
- Compare the box temperature on the main display with the setpoint.
- Open and close the door gently to check that it still moves freely.
- Write down the door temperature shown and the amount of ice seen, for the technician.
How a technician diagnoses error code DtL
- Read the alarm and door temperature value.
- Check door setpoint, offset and delay settings.
- Test the door heater, if fitted, for current.
- Verify the door sensor against a reference thermometer.
- Check the door seal and closing action.
- Look up the manual's Troubleshooting Tables entry for dtL.
- Door heater circuits run on line voltage.
- Sensor and setpoint values are service settings.
- Removing frozen gaskets can tear them without the right method.
How error code DtL differs from similar codes
DtL is the cold counterpart of dtH on the same controller.
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 keep the walk-in running with dtL?
Yes, but ice at the door can stop it sealing, so have it checked soon.
Will dtL clear itself?
When the door temperature rises back within limits, yes.
Does dtL mean the box is too cold?
Not necessarily. It refers to the door sensor.
Need help with Nor-Lake error code DtL?
A technician confirms the cause on site and gives you the price in writing before any work starts.