If faults are occurring on your Danfoss refrigeration system, it is very important to discover it quickly. Error codes are a great way to find out the initial problem. Error codes are usually displayed on the controller.
Danfoss Refrigeration error codes:
| Alarm code | Possible cause | Solution |
| E0 | Cold room temperature sensor not working properly | • Check that cold room temperature sensor is working properly• If the problem persists replace the sensor |
| E1 | Defrost sensor not working properly (In this case defrosts will last time d3) | • Check that defrost sensor is working properly• If the problems persists replace the sensor |
| E2 | Eeprom alarmAn EEPROM memory alarm has been detected (All outputs except the alarm one aredeactivated) | • Switch unit off and then back on again |
| E8 | Man-in-room alarm | • Reset the alarm input inside the cold room |
| Ec | Compressor protection tripped (e.g. thermal protection or max pressure switch)(All outputs except the alarm one – whereapplicable – are deactivated) | • Check that compressor is working properly• Check compressor absorption• If the problem persists contact the technicalassistance |
| Ed | Open door – alarm (Open door and tdo-time has expired) | Check door / door contact |
| Temperature shown on display is flashing | Minimum or maximum temperature alarm. The temperature inside the cold room has exceeded the min. or max. temperature alarm setting (see variables A1 and A2, user programming level) | • Check that the compressor is working properly.• Sensor not reading temperature properly or compressor start/stop control not working. |
• If the problem persists replace the sensor
• If the problems persists replace the sensor
An EEPROM memory alarm has been detected (All outputs except the alarm one are
deactivated)
(All outputs except the alarm one – where
applicable – are deactivated)
• Check compressor absorption
• If the problem persists contact the technical
• Sensor not reading temperature properly or compressor start/stop control not working.
Written by
Ali Elm
Ali is the Head of Operations at Be Cool Refrigeration with over a decade of hands-on experience in HVAC and commercial refrigeration. He oversees every installation, repair, and maintenance project, making sure the work meets the highest standards. Ali holds full F-Gas certification and has worked across residential, commercial, and industrial refrigeration systems throughout London and the South East. When he is not on site, he writes these guides to help business owners and homeowners understand their cooling systems better.