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Error code · Kolpak · Walk-in coolers & freezers

Kolpak Walk-In Cooler Error Code DISP EXTERNAL ALARM 2: Display AUX2 Active

DISP EXTERNAL ALARM 2 means Display AUX2 FUNCTION is set to EXT ALARM and the digital input is active. Equipment wired to the Display's second auxiliary input is signaling a condition. Press ENTER to silence the alarm for one hour and trace the connection.

Medium · inspection needed

Medium: an outside device is signaling a condition the controller cannot describe.

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Code
DISP EXTERNAL ALARM 2
Maker
Kolpak
Equipment
Walk-in coolers & freezers
Applies to
ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)

What does Kolpak DISP EXTERNAL ALARM 2 mean?

Display AUX2 can be set up as an external alarm input. With AUX2 FUNCTION on EXT ALARM, the Display watches a digital contact and treats a change as an alarm. When that digital input becomes active, the text alarm DISP EXTERNAL ALARM 2 appears in the Alarms menu. The controller only reads the contact, so it has no knowledge of what is on the other side. It could be a monitoring switch, a power relay, or a signal from other equipment, depending on how the walk-in was wired. As long as the input stays active, so does the alarm. Pressing ENTER quiets the display for one hour, and the alarm sounds again if the input is still active. Because Display AUX2 can also be set as a temperature input, a mix-up in the function setting is another thing to rule out.

Affected models and control systems

ArcticFox OEM Controller with Deluxe Display on Kolpak walk-ins. This alarm refers to Display AUX2 and is listed in the Alarms menu on page 17.

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

  • DISP EXTERNAL ALARM 2 text in the Alarms menu
  • Audible alarm from the display
  • Equipment tied to the second Display input showing a warning
  • Alarm sounding again an hour later

Possible causes

Likely causes — what usually sits behind DISP EXTERNAL ALARM 2 on this control. A technician confirms which one it is before any part is replaced.

  • Device on Display AUX2 signaling a real condition
  • Relay or switch contact stuck in the active position
  • Display AUX2 FUNCTION left on EXT ALARM after a rewire
  • Wire at the Display AUX2 terminal touching ground or another conductor

Safe checks before calling for service

✓ What an operator can do
  1. Press ENTER to silence the alarm. It stays quiet for 1 hour and sounds again if the input is active.
  2. Ask who installed the Display, or read the job notes, to find what AUX2 is wired to.
  3. Look at that equipment from outside for a lit warning or tripped breaker.
  4. Record the alarm text and the equipment, and give it to the technician.

How a technician diagnoses DISP EXTERNAL ALARM 2

  1. Verify Display AUX2 FUNCTION reads EXT ALARM and not a temperature input.
  2. Identify the device on the input and read its status.
  3. Meter the input at the Display terminals.
  4. Isolate the field wire to see whether the alarm clears.
  5. Fix the device or wiring, or correct the function if it should not be an alarm input.
! Leave this to a technician
  • The Display terminals are live and the housing has to be opened to reach them.
  • The connected device may protect other equipment, so it should not be bypassed to stop the alarm.
  • Function changes are controller programming and should be matched to the installation record.

Technical reference

Document
ArcticFox Deluxe Display - Original Instructions, Installation, Operation and Maintenance Manual
Edition
Part No. 500002385-4, 5/23
Models / control
ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)
Section
ArcticFox OEM Controller - Alarms Menu, p.17
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.

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Related Kolpak walk-in cooler & freezer error codes

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DISP EXTERNAL ALARM 2Questions about Kolpak DISP EXTERNAL ALARM 2
Is this alarm about the walk-in temperature?

Not by itself. It reports that the Display AUX2 input is active.

What if I have no device on AUX2?

Then the function may be set to EXT ALARM by mistake, or the wire is shorted. A technician can check both.

How does this differ from DISP EXTERNAL ALARM 1?

It is the same alarm type for the second Display input instead of the first.

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