Nor-Lake LogiTemp Walk-In Alarm Code EA3: External Alarm 3 Active

What does Nor-Lake error code EA3 mean?

The third external alarm input is one more channel that an installer can connect to a device outside the controller. When that device trips, the LogiTemp reports EA3 on the display. The kind of device depends on how the system was installed, so the same code can mean quite different things on two walk-ins. The controller itself is working, because it did what it should and reported an outside signal. That is the main point to understand: EA3 is a message from the equipment around the box, relayed by the controller, and the job is to find out what triggered it and whether the condition is real. The signal can come from a device doing its job, from its wiring or terminals, from the setting for that input, or from the condition being monitored. A technician begins at the terminals for the third input, follows the wire to the device and checks the device state against what the box is doing. Without that, the display alone cannot separate a harmless trip from one that guards something important.

Affected models and control systems

This applies to LogiTemp controllers on Nor-Lake walk-in coolers and freezers where the third external alarm input is in use.

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

• EA3 on the display
• An alarm LED lit on the controller
• Box air temperature normal near the middle shelf
• A stopped fan, water or tripped switch outside the box

Possible causes

Listed in Nor-Lake's documentation

• Device connected to the third external alarm input has tripped
• Its wiring and terminals
• The setting for that input
• The condition being monitored

Other likely causes — what usually sits behind error code EA3 on this control. A technician confirms which one it is before any part is replaced.

• Evaporator or condenser fan proving switch opened because a fan stopped
• Water-level float in a sump or pan lifted by a blocked drain
• Terminal screw loosened by vibration so the circuit opens like a trip

Safe checks before calling for service

How a technician diagnoses error code EA3

1. Read EA3 and trace the wire from the third input to the device.
2. Check the monitored condition directly.
3. Test the device contact and the terminals with a meter.
4. Confirm how the input is set up on the controller.
5. Correct the condition or replace the device after testing.

How error code EA3 differs from similar codes

EA1 and EA2 are the same type of alarm on the first and second external inputs. EA3 refers only to the third.

Technical reference

Document

LogiTemp Electronic Controller System Operations Manual (171527 Rev. A), Alarms & Notifications List pp. 47-51

Edition

171527 Rev. A, 2025 (Refrigerated Solutions Group)

Models / control

LogiTemp / KE2 Evap OEM (Split-Pak 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.