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User Guide
Danfoss troubleshooting guide
for supermarket electronics
www.danfoss.com

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Summarization of Contents

1. AK-SM 800A
Compressors not coming on with high suction
Troubleshoot compressors not engaging due to high suction pressure, phase loss, or oil fail.
IO Offline
Steps to resolve Input/Output modules being offline, checking power, network, and termination.
Case Controller 'Mismatch' Issue
Address issues where case controller type does not match the configured program.
AK-SM 800A Stuck on 'Verifying Nodes'
Resolve AK-SM 800A freezing on the 'Verifying Nodes' screen during startup.
2. AK-SM 800
Compressors not coming on with high suction
Troubleshoot compressors not engaging due to high suction pressure, phase loss, or oil fail.
Keypad not Responsive
Steps to resolve a non-responsive keypad on the AK-SM 800 unit.
IO Offline
Steps to resolve Input/Output modules being offline, checking power, network, and termination.
Database will not load via USB
Troubleshoot issues preventing the database from loading from a USB drive.
Case Controller 'Mismatch' Issue
Address issues where case controller type does not match the configured program.
AK-SM 800 Stuck on 'Verifying Nodes'
Resolve AK-SM 800 freezing on the 'Verifying Nodes' screen during startup.
Missing License
Troubleshoot missing license errors and potential solutions for AK-SM 800.
Host Comm/ Host Count Error
Resolve communication errors related to host connectivity and controller count.
Slowness in AK-SM 800
Identify causes for slow performance or unresponsiveness in the AK-SM 800.
DNS Failure Alarm
Address DNS failure alarms, typically related to email server communication.
3. AK-CC 550A
AKV Not Opening
Troubleshoot why the AKV valve is not opening, checking voltage and settings.
Incorrect Superheat
Address issues related to incorrect superheat readings affecting valve operation.
Pe Error (E20)
Troubleshoot Pe Error (E20) by checking transducer wiring and voltage.
S3 Error (E25)
Resolve S3 Error (E25) by verifying parameters related to return air sensor.
AK-CC 550A Case Controllers Offline
Troubleshoot offline AK-CC 550A case controllers by checking network and connections.
Mismatch Error during v2.0 Firmware Install
Resolve mismatch errors when installing v2.0 firmware on AK-CC 550A.
Configuration (AK-CC 550A to AK-SM 800)
Guidance on configuring AK-CC 550A to communicate with AK-SM 800.
Dual Temp Setup
Configure dual temperature settings using digital inputs and parameters.
4. AK-CC 750
Replacing AK-CC 750
Steps for replacing an AK-CC 750 controller, including setup and configuration.
5. AK-XM Modules
AKS Temp Sensor not Reading on IO Module
Troubleshoot AKS temperature sensors not being read by the IO module.
AK-XM 103A module not coming online
Resolve issues with the AK-XM 103A module failing to come online.
Relay will not respond to override through program
Troubleshoot relays not responding to program overrides on the module.
Sensor Readings Fluctuating
Address fluctuating sensor readings, checking power, ground, and connections.
Intermittent IO Offline Issues
Resolve intermittent offline issues with Input/Output modules.
6. Storeview
Unable to Connect to Site that Works in Web Browser
Troubleshoot inability to connect to a site in Storeview that works in a browser.
7. AK-SC 255
Battery Replacement/Low Battery Alarm
Steps for replacing the battery and addressing low battery alarms.
255 Alarm Dialout Issues
Troubleshoot issues with the 255 unit's alarm dialout functionality.
'Press 9 to Clear Database' Message
Resolve the 'Press 9 to Clear Database' message and reload data.
'Alarm' Flashing on 255, LED Red but no active/acknowledged alarms
Troubleshoot 'Alarm' flashing and red LED on 255 with no active alarms.
IO Offline
Steps to resolve Input/Output modules being offline, checking power, network, and termination.
Missing License
Troubleshoot missing license errors and potential solutions for AK-SC 255.
Black Display Screen
Troubleshoot issues with a black display screen on the unit.
White Display Screen
Troubleshoot issues with a white display screen on the unit.
Host Comm/Host Count Error
Resolve communication errors related to host connectivity and controller count.
8. AKC 55
AKC 55 IO Relay Chattering
Troubleshoot IO relay chattering issues with AKC 55 modules.
AKC 55 Loses Program on Power Cycle
Address AKC 55 losing its program after a power cycle, likely battery issue.
No Communication with AK2 Modules
Troubleshoot communication failures between AKC 55 and AK2 modules.
9. AKC 164
Sensor Failure Status
Troubleshoot sensor failure status indicating issues with KVQ valve or sensors.
10. AKA 65
'Invalid License'
Resolve 'Invalid License' errors for the AKA 65 software.
'Unable to locate compatible Win55' Error
Address 'Unable to locate compatible Win55' errors in AKA65 software.
Unable to Fully Connect to Site Remotely
Troubleshoot remote connection issues, checking site setup and network type.
Unable to Direct Connect to AK-SC 255 Locally
Troubleshoot direct local connection issues with AK-SC 255.