Danfoss Error 1027 Guide

As the keys were released, the display flickered back to life, the error vanished, and Fan #4 began its steady climb back to full speed. The "brain" and "muscle" were talking again.

Check motor cable shielding and inspect power card components for burning. Technical Support and Next Steps

This alarm typically indicates that the drive's internal digital signal processor (DSP) is failing to communicate with the fieldbus or internal hardware components. Error 1027 vs. Other Danfoss Faults

Understanding why this error happens helps isolate the root cause before replacing expensive components:

If the fault persists, you may need a (Parameter 14-22), but be aware this erases all custom settings. Swap Control Cards : danfoss error 1027

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.

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

If the master resumes cyclic communication before the timeout time expires, the drive may auto-clear the alarm (depending on Parameter 8-07 Diagnosis Trigger).

In a bustling manufacturing plant, the giant cooling fans were the rhythmic heartbeat of the facility. At the center of this rhythm sat a Danfoss VLT Drive, the sophisticated "conductor" responsible for managing the power flow to the motors. As the keys were released, the display flickered

This error is almost always hardware-related rather than a programming mistake. The most common reasons include:

: If the fault persists, you may need to perform a factory reset by holding [Main Menu] simultaneously while powering up the drive.

Specifically, often indicates a CAN telegram failure —the drive is attempting to send a communication signal but failing, which can suggest a deeper hardware error within the control board or internal communication bus.

By methodically checking the CAN bus wiring, termination, and isolating the drive from the network, you can confirm whether the issue is external or internal. If all external factors are eliminated and the error remains, the conclusion is clear: a hardware malfunction has occurred within the frequency converter. In this case, further repairs or replacement will require the expertise of a Danfoss-authorized service partner. Technical Support and Next Steps This alarm typically

There may be a physical fault or a failure in how the drive’s internal components "talk" to each other. Step-by-Step Troubleshooting

Danfoss drives (including the popular VLT® HVAC Drive, VLT® AutomationDrive, and VACON® series) rely on robust fieldbus communication for speed reference, start/stop commands, and feedback. When Error 1027 appears, the drive is essentially saying, "I cannot hear the master controller." Ignoring this fault can shut down a production line, freeze a chiller plant, or halt a conveyor system.

If using an inverter, verify all DC connectors (like MC4) are properly crimped and polarity is correct. :