Danfoss Error 1027 [verified] Jun 2026

Disconnect the drive from AC mains and wait for the DC capacitors to discharge (refer to manual for discharge time).

Before a CAN bus failure triggers, the drive may experience a data read/write conflict. If the underlying power data or parameter history stored within the control card EEPROM is defective, outdated, or takes too long to load (timeout), the drive loses its structural baseline and aborts communication entirely. 3. Power Surge or Component Degradation

If you have a twin unit, try swapping the control card to see if the error follows the card (indicating a hardware failure).

is a serious alarm. It is not a warning that can be ignored, nor is it a fault that can be fixed by simply adjusting a parameter. The code is the drive's way of reporting an internal hardware failure that is preventing it from sending CAN messages. While a simple power cycle is worth a try, persistent occurrence almost always necessitates professional repair or replacement by a Danfoss supplier or authorized service center. danfoss error 1027

Power down the unit and wait for the display to turn off completely to allow capacitors to discharge. Power the unit back on and press the button on the Local Control Panel (LCP). Extend Deceleration Time

Inspect any serial communication or Fieldbus cables for damage or loose seats.

Software corruption, though less common than hardware failure, can sometimes manifest as communication errors. Perform a parameter initialization (also known as a "master reset") to return the drive to its factory default settings. Be sure to record all your application-specific parameters first, as this process will erase them. The procedure varies slightly by model but is typically found in parameter group 14-22 or similar and set to value 2 "Initialization." Disconnect the drive from AC mains and wait

If the 1027 alarm code refuses to clear after checking connections, flashing the firmware, and initializing the parameters, contact a regional repair provider to evaluate the unit's control board logic.

On Danfoss variable frequency drives (VFDs), the code (frequently appearing under the Alarm 38 umbrella) signifies a severe internal hardware communication fault where a CAN telegram cannot be sent due to a possible hardware or control card error . This specific sub-code maps to the internal communication infrastructure, alerting you that the drive’s digital processing unit is unable to transmit vital operational packets within its internal controller area network.

He traced the sensor wires to the evaporator coils. The insulation was intact, the connections clean. Then he saw it: a tiny, almost invisible scorch mark near the compressor relay. He touched it with a gloved finger. Still warm. It is not a warning that can be

This means that while the problem originates from a CAN communication failure, it is often a symptom of a deeper hardware malfunction within the drive itself, rather than just a loose cable.

If you want to dive deeper into a specific system setup, let me know:

Keep the keys pressed while re-applying mains power to the drive.

Disconnect the motor leads (at the drive output). Run the drive without a load.

Physical vibration in demanding industrial environments can cause connectors to back out over time: