Nor-Lake LogiTemp Walk-In Error Code Prf: Process Failure
Prf means process failure: the KE2 Basic Display cannot communicate with the controller on a Nor-Lake LogiTemp walk-in. The controller behind it may still run the compressor and fans on its saved settings, so the walk-in can keep cooling while you lose sight of what it is doing. Check the box temperature with a thermometer and call us.
Medium: cooling may continue, but with the display down, a problem could go unseen.
- Code
- Prf
- Maker
- Nor-Lake
- Equipment
- Walk-in coolers & freezers
- Applies to
- LogiTemp / KE2 Evap OEM (Split-Pak systems, A1 refrigerants)
What does Nor-Lake error code Prf mean?
The Basic Display on a LogiTemp walk-in is a separate module that talks to the KE2 controller over a cable. It shows readings and takes changes, but the controller does the real work. When the link between them breaks, the display raises Prf, and the screen can no longer show readings or accept changes. That is the odd part of this code: the controller behind the display may still be running the compressor and fans on its saved settings, so the walk-in can continue to cool, while you lose sight of what it is doing and cannot tell if an alarm is active. A walk-in running blind is a risk because a warm box would show up on the display first. The reasons are the cable between the Basic Display and the controller, the connectors at both ends, power to the display and controller, or the display module itself. A display that is dark points to power or the module, while a display that shows Prf points to the cable or the controller side of the link.
Affected models and control systems
This applies to the KE2 Basic Display and the LogiTemp / KE2 Evap OEM controller on Nor-Lake Split-Pak walk-in coolers and freezers with A1 refrigerants.
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
- Prf on the display, or a dark or frozen display
- Settings that cannot be changed from the keypad
- Compressor and fans still running
- No way to see the box temperature on the controller
Possible causes
Listed in Nor-Lake's documentation
- Cable between the Basic Display and the controller damaged
- Loose or corroded connectors at both ends
- No power to the display or controller
- Display module failed
Other likely causes — what usually sits behind error code Prf on this control. A technician confirms which one it is before any part is replaced.
- Display cable pinched when the panel was closed after service
- Moisture in the display plug after a washdown
- Display power supply loose at its terminal
Safe checks before calling for service
- Note whether the display is lit and what it shows.
- Check the box temperature with a thermometer, since you cannot rely on the display.
- Listen to see whether the compressor and fans still run.
- Call us to schedule service and tell us what the display shows.
How a technician diagnoses error code Prf
- Read Prf and see whether the display is powered.
- Confirm the controller is running the compressor and fans.
- Inspect the display cable and both connectors.
- Check power to the display and controller.
- Replace the cable or display module after the test.
- The controller panel carries live control voltage.
- Without the display, a technician reads the controller another way and needs the right tools.
- The cable runs through the box wall and needs careful tracing.
How error code Prf differs from similar codes
Other codes such as CCA or CLL report a communication loss between controllers. Prf is between the display and its own controller.
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.
Related Nor-Lake walk-in cooler & freezer error codes
Is the walk-in still cooling with Prf?
Often yes. Check with a thermometer, because the display cannot be trusted.
Can I reset it?
A power-off and on can restore the link if it was a glitch.
Does Prf mean the controller is dead?
No. The link, the display or the power may be the cause, and the controller may be fine.
Need help with Nor-Lake error code Prf?
A technician confirms the cause on site and gives you the price in writing before any work starts.