Nor-Lake Walk-In Error Code Hd3: High Monitor Temp 3 Alarm
Hd3 on a Nor-Lake Split-Pak walk-in with a LogiTemp or KE2 Evap controller means monitor temperature 3 is above its high alarm setpoint for longer than the delay. The manual's Troubleshooting Tables give corrective actions.
High: a monitored temperature is above its limit, so stored product may be at risk.
- Code
- Hd3
- 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 Hd3 mean?
Hd3 is the High Mon3 Temp Alarm in the LogiTemp controller's Alarms and Notifications list for Nor-Lake Split-Pak systems. Monitor 3 is the third extra monitoring point on the combo display. It has its own high setpoint and delay. When the reading stays above the setpoint through the delay, the controller shows Hd3 with HIGH MONITOR TEMP3. The manual lists the meaning and refers the reader to the Troubleshooting Tables from page 52 for what to do. It does not describe where monitor 3 is mounted. An installer may have placed it in the box, on a product shelf or elsewhere. As a result, the same code can mean different things on different walk-ins, and the first job is to learn what the monitor 3 sensor watches on yours.
Affected models and control systems
Hd3 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 setpoint and delay are settings for monitor 3.
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
- Hd3 or HIGH MONITOR TEMP3 on the display
- Monitor 3 reading above its setpoint
- Warm air at the monitored location
Possible causes
Likely causes — what usually sits behind error code Hd3 on this control. A technician confirms which one it is before any part is replaced.
- Monitor temperature 3 above its high alarm setpoint for longer than the delay
- Door left open while stocking
- Evaporator fan stopped or iced so air does not reach the monitored point
- Monitor 3 sensor placed where heat from a nearby source reaches it
Safe checks before calling for service
- Close the door and check it seals.
- Look at the main box temperature.
- Check the area around the monitor 3 sensor for heat sources or blocked air.
- Move food at risk if the box is warm.
- Write down Hd3, the reading and the time, for the technician.
How a technician diagnoses error code Hd3
- Read the alarm and monitor 3 value.
- Find the monitor 3 sensor position and compare with a reference thermometer.
- Check the evaporator fans and defrost.
- Check compressor and condenser operation.
- Check setpoint and delay.
- Look up the Troubleshooting Tables entry.
- Fan and compressor testing involves line voltage.
- Refrigerant circuit readings need gauges and training.
- Monitor 3 settings are in the service menu.
How error code Hd3 differs from similar codes
Hd3 matches Hd2 but for monitor 3.
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 Hd3 an emergency?
If the box is warm, protect the food. If only the monitor point is warm, it may be local.
Will Hd3 clear alone?
When the reading falls below the setpoint, yes.
Why do I see Hd3 and not Hd2?
They are different monitor points. Each has its own setpoint.
Need help with Nor-Lake error code Hd3?
A technician confirms the cause on site and gives you the price in writing before any work starts.