Nor-Lake LogiTemp Walk-In Error Code SCC: Short Compressor Cycle

What does Nor-Lake error code SCC mean?

A compressor is built to run in long cycles. Each start draws a surge of current and strains the motor and contacts, so a compressor that starts every minute or two wears out fast and wastes power. On a walk-in using LPCO control, the low pressure cut-out ends each run, because the system pumps down to a set pressure and stops. A short cycle therefore points to what ends the run too soon, or what lets it restart too soon. When the controller sees the compressor cycling too often, it shows SCC. The box may run warmer than it should because the compressor never runs long enough to cool it. The reasons are low cut-out and cut-in settings that are too tight, a liquid line valve that leaks so pressure rises after each stop, a low refrigerant charge that trips the cut-out soon after start-up, or poor evaporator airflow or an iced coil that triggers an early cut-out. SCC can come from several different causes, so pressures must be read before choosing a repair.

Affected models and control systems

This applies to LogiTemp KE2 controllers on Nor-Lake Split-Pak walk-ins using LPCO (low pressure cut-out) control.

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

• SCC on the display
• Compressor starting and stopping every few minutes
• Box temperature slowly rising
• Clicking from the contactor

Possible causes

Listed in Nor-Lake's documentation

• Low pressure cut-out and cut-in settings set too tight
• Liquid line valve that leaks, so pressure rises after each stop
• Low refrigerant charge that trips the cut-out soon after start-up
• Poor evaporator airflow or an iced coil that triggers early cut-out

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

• Evaporator fan weak or stopped, so the coil cannot absorb heat
• Slow leak at a joint that lowers the charge a little each week
• Defrost not clearing the coil and the airflow dropping

Safe checks before calling for service

How a technician diagnoses error code SCC

1. Read SCC and count the compressor cycles per hour.
2. Connect gauges and watch pressures through a cycle.
3. Check the liquid line valve for leak-through.
4. Inspect the evaporator for ice and check the fans.
5. Review the cut-out and cut-in settings and charge, then confirm run times.

How error code SCC differs from similar codes

Pdt reports a pump-down that took too long. SCC reports the opposite: runs that end too soon.

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.