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User Guide | Danfoss troubleshooting guide for supermarket electronics
6. Storeview
7. AK-SC 255
8 | BC337731384771en-000301
Unable to Connect to Site that Works in Web Browser
1. Delete site from Storeview, re-add.
Battery Replacement/Low Battery Alarm
1. Do not power down controller
2. Remove old battery. Be careful not to bend the battery clip any more than necessary; battery clip
can break
3. Insert new battery
255 Alarm Dialout Issues
1. Verify modem has power
2. Reset modem, 255
3. Verify info on Alarm Routing screen
4. Verify phoneline is active (inbound call from phone)
5. Verify phone # is correct (outbound call from corded phone on modem phoneline)
6. Verify modem config screen
'Press 9 to Clear Database' Message
1. Database must be cleared, no options to bypass.
2. Press 9 to clear
3. Reload database after clear is complete
'Alarm' Flashing on 255, LED Red but no active/acknowledged alarms
1. Go to Configuration → Alarms → Service
a. To reset the Alarm! Message and LED, try enabling a one-time Test Alarm
b. If this does not work, use 'Clear Alarm Log' option
IO Offline
1. Verify Power to modules, Complete rescan
2. Verify 'Channel Lonworks' enabled on Network Nodes screen
a. If not, update and rescan afterwards
3. Verify EOL resistor in place at end of loop
a. 120 Ω resistor or term switch in On position at last comm module
b. If term switches exist on modules in middle of loop, need to be in Off position
4. Verify comm module addresses via rotary switches
5. Isolate loop in sections, rescan
a. Identifies where comm problem may be introduced
6. If module is still offline, remove power to communication module for 15 seconds, repower. Do
Complete Rescan again.
Missing License
1. Please contact Danfoss Tech Support and supply the MAC address. Tech support will help reinsert
the license
2. The controller will still operate regularly, but you won't be able to make any changes to
configuration
a. In need of immediate assistance, you may load in the back-up/old database to bring the license
back
3. Verify CPU card is inserted correctly. Reset the controller
Black Display Screen
1. Verify ribbon cable between the screen and CPU board
a. If not loose or disconnected, the unit will need to be replaced
White Display Screen
1. Verify that ribbon cable from the baseboard is connected at both ends (Connector at the display
may have worked loose)
© Danfoss | Climate Solutions | 2022.02
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