Common Danfoss Controller Display Alarms

1. “CON” Alarm:

• This is a condenser alarm.
• This will be displayed when the condenser is not getting enough airflow over it.
• Possible reasons as to what the cause for this is:
• Condenser is blocked.
• Condenser fan motor is not working or is stuck.
• High ambient temperatures of +45°C.
• There is an obstruction in front of the grill of the cabinet.

2. “ULO” Alarm:

• This is a low voltage alarm.
• This will be displayed when the incoming voltage to the cabinet is lower than 195V.
• The cabinet will cut to the voltage protection, to help protect the cabinet from any damages.
• Possible reasons as to what the cause for this is:
• Cabinet is plugged into a multiplug or via an extension cable.
• Cabinets is being powered by a generator.
• Eskom are working on the power in the area.

3. “DOR” Alarm:

• This is a door alarm.
• This will be displayed when the cabinets door has been left open for more than one minute.
• Possible reasons as to what the cause for this is:
• Cabinet door is not closing fully.
• The door sensor is faulty or not making the necessary contact.
• The door sensor has been damaged or is faulty.

4. “E01/02/03” Alarm:

• This is a sensor alarm.
• This will be displayed when the controller cannot make contact with one of the probes.
• The controller will display either “E01”, “E02” or “E03”.
• Possible reasons as to what the cause for this is:
• The probe has disconnected from the controller.
• The probe is faulty, been cut or damaged.