Kolpak Walk-In Cooler Alarm EXCESS DEFROST: 32 Defrosts in 48 Hours

What does Kolpak EXCESS DEFROST mean?

A walk-in normally defrosts a few times a day. The ArcticFox controller counts the defrosts that start, and when it records 32 or more in a 48-hour period, it raises the text alarm EXCESS DEFROST in the Alarms menu. That is a defrost about every hour and a half, far more often than a scheduled routine would call for. The manual defines the alarm only by that count. Its action is to press ENTER to silence the alarm for 1 hour while the condition is addressed, and it comes back if the system is not corrected. No causes are listed, and the manual does not say what starts the extra defrosts. A technician would look at what is telling the controller to defrost, such as a coil sensor reading, a defrost setting or a coil that ices up quickly, and at what is making the evaporator frost so heavily, like a door left open or a refrigeration problem.

Affected models and control systems

The manual covers the ArcticFox OEM Controller with Deluxe Display used on Kolpak walk-in coolers and freezers.

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

• EXCESS DEFROST in the Alarms menu
• Defrost running again and again
• Room temperature rising during repeated defrosts
• Heavy ice on the evaporator

Possible causes

Likely causes — what usually sits behind EXCESS DEFROST on this control. A technician confirms which one it is before any part is replaced.

• 32 or more defrosts within 48 hours
• Door gasket or door left open, feeding moist air to the evaporator and icing it quickly
• Coil temperature sensor misreading so the controller keeps calling for defrost
• Defrost termination or schedule settings changed so cycles start too often

Safe checks before calling for service

How a technician diagnoses EXCESS DEFROST

1. Read the Alarms menu and the defrost count and history on the controller.
2. Check the defrost schedule and termination settings.
3. Check the coil temperature sensor against a reference thermometer.
4. Inspect the evaporator for frost patterns, the drain and the door seals.
5. Check for moisture sources and air leaks into the room.
6. Correct the cause and confirm defrosts return to their normal count.

How EXCESS DEFROST differs from similar codes

EXCESS DEFROST counts defrosts, so it can appear without any temperature alarm. The COIL TEMP SENSOR alarm may point to a related cause.

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.16

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.