What does alarm code A97 mean on a Danfoss EKC 202 controller?

Alarm A97 on the Danfoss EKC 202 indicates a communication fault with the master controller or ADAP-KOOL network. Check RS485 wiring for breaks or incorrect termination, verify the unit address is unique on the network, and confirm the baud rate matches all connected controllers.

How do I configure defrost on a Danfoss EKC 301 evaporator controller?

Access the defrost settings in menu r-. Set r-01 for defrost type (0=electric, 1=hot gas, 2=off cycle), r-02 for defrost termination temperature (typically +12°C for electric), r-03 for maximum defrost time, and r-04/r-05 for defrost interval hours. Always verify the drip time r-06 is set to allow condensate drainage.

What is the Danfoss AKM system and how does it communicate?

Danfoss AKM (Adap-Kool Manager) is a supervisory control system that communicates with EKC and AK series controllers via LON or RS485 MODBUS. It provides centralised monitoring, alarm management, and data logging for supermarket refrigeration systems. Ensure correct protocol selection in both AKM and controller settings.

How do I manually defrost a Danfoss Optyma refrigeration unit?

On Optyma Plus units, press and hold the DEF button for 5 seconds to initiate a manual defrost. The display will show 'dEF' during the defrost cycle. For Optyma Slim Pack units, access manual defrost via the EKC 102 controller by pressing the up and down arrows simultaneously for 3 seconds.

What does Danfoss fault code 8 mean on AK-CC 210 controllers?

Fault code 8 on the Danfoss AK-CC 210 indicates a sensor fault — typically S3 (air temperature sensor) open or short circuit. Check sensor resistance: at 0°C it should read approximately 10kΩ for NTC10k sensors. Replace the sensor if resistance is out of range or if wiring shows continuity issues.

refrigeration

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Common Danfoss Error Codes

A97

Network communication fault on ADAP-KOOL system

Thermostat sensor (S2) fault — open or short circuit

Defrost sensor (S3) fault — check NTC resistance

Condenser sensor fault or high condenser temperature alarm

Compressor external protection trip — check motor starter

Frequently Asked Questions — Danfoss

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