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Error code · Kolpak · Walk-in coolers & freezers

Kolpak Walk-In Cooler Error Code DISP EXTERNAL ALARM 1: Display AUX1 Active

DISP EXTERNAL ALARM 1 means Display AUX1 FUNCTION is set to EXT ALARM and the digital input is active. A device wired to the Display's first auxiliary input is signaling a condition. Press ENTER to silence the alarm for one hour and find what is connected.

Medium · inspection needed

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

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Code
DISP EXTERNAL ALARM 1
Maker
Kolpak
Equipment
Walk-in coolers & freezers
Applies to
ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)

What does Kolpak DISP EXTERNAL ALARM 1 mean?

The Deluxe Display has its own auxiliary inputs, apart from the Main board. When AUX1 FUNCTION on the Display is set to EXT ALARM, a contact connected there is treated as an alarm line. The controller reads the digital input. If the input is active, the text alarm DISP EXTERNAL ALARM 1 appears in the Alarms menu. The DISP in the name matters because it tells you the signal came in on the Display and not on the Main board, which has its own EXTERNAL ALARM 1. The controller does not know what the connected device is or how serious the condition might be. The alarm stays as long as the input is active. ENTER silences the sound for one hour, after which it returns if the input has not changed. The real work is to identify the device wired to Display AUX1.

Affected models and control systems

ArcticFox OEM Controller with Deluxe Display on Kolpak walk-ins. This alarm refers to Display AUX1 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 1 text in the Alarms menu
  • Audible alarm from the display
  • Connected device showing a tripped state
  • Alarm back after one hour of silence

Possible causes

Likely causes — what usually sits behind DISP EXTERNAL ALARM 1 on this control. A technician confirms which one it is before any part is replaced.

  • Device wired to Display AUX1 reporting a genuine condition
  • Contact on that device stuck, keeping the Display input active
  • Display AUX1 FUNCTION left on EXT ALARM with nothing intended to use it
  • Loose wire at the Display AUX1 terminal shorting the input

Safe checks before calling for service

✓ What an operator can do
  1. Press ENTER to silence the alarm for 1 hour. It returns if the input is still active.
  2. Look for a label or installation note that says what is wired to the Display's first auxiliary input.
  3. Check that device from outside for a warning light or tripped switch.
  4. Tell the technician the alarm text and what device you found.

How a technician diagnoses DISP EXTERNAL ALARM 1

  1. Check that Display AUX1 FUNCTION is EXT ALARM.
  2. Identify the connected device and read its status.
  3. Meter the input at the Display terminals to confirm it is active.
  4. Lift the field wire to see if the alarm clears.
  5. Repair the device or wiring, or change the function if nothing belongs on the input.
! Leave this to a technician
  • Display terminals carry power while the unit is on, and the Display housing must be opened to reach them.
  • Bypassing an input that protects equipment can hide a real problem.
  • Changing the AUX1 function reprograms the Display and must match the installation.

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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DISP EXTERNAL ALARM 1Questions about Kolpak DISP EXTERNAL ALARM 1
Why does the alarm start with DISP?

It shows that the signal came into the Display's auxiliary input, not the Main board.

Is this the same as EXTERNAL ALARM 1?

No. EXTERNAL ALARM 1 is the Main AUX1 input. DISP EXTERNAL ALARM 1 is the Display AUX1 input.

Can pressing ENTER end it?

It silences the sound for one hour only. The device or wiring must be corrected.

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