Danfoss AK-SC255

REFRIGERATION &
AIRCONDITIONING
MAKING MODERN LIVING POSSIBLE
AK-SC255
Troubleshooting Guide
Troubleshooting Guide

Danfoss AK-SC255 Specifications

General

Supply voltage	24 V AC/DC
Analog inputs	6
Triac outputs	4
Protection Class	IP20
Housing Material	Plastic
Communication	RS485
Display	LCD
Storage Temperature	-20°C to +70°C
Relative Humidity	10-90% RH, non-condensing
Weight	0.3 kg

Summary

Communication and Network Issues

IO Communication Failure

Troubleshoot I/O not communicating with the AK-SC255 controller or comm module issues.

Scanning and Network Failure

Address issues with the AK-SC255 failing to scan or experiencing I/O network failures.

System Errors and Display Problems

License and Software Upgrade Errors

Resolve license errors, lost licenses, and understand software upgrade policies.

Screen and Display Malfunctions

Troubleshoot white screens, flickering screens, blank screens, and world map display issues.

Operational and System Faults

Power-Up and Error Message Issues

Diagnose problems with the unit not powering up or receiving error messages.

Database, Clock, and EDF Errors

Address issues with database history availability, clock malfunctions, and EDF messages.

Interface and Configuration Problems

Keypad and Ethernet Connectivity

Troubleshoot a non-responsive keypad or Ethernet connection issues.

Web Browser and Authorization Codes

Resolve web browser issues and problems with authorization codes.