Danfoss Error 1027 |link| Jun 2026

Error 1027, he realized, wasn’t a software glitch. It was Danfoss’s way of saying: The machine knows it’s lying to you.

Follow this field-tested workflow. It assumes you have a multimeter, a laptop with Danfoss MCT-10 or VACON® NCDrive, and physical access to the drive.

Always check physical termination before blaming the drive.

: Severe electrical noise from improper grounding, unshielded motor cables, or nearby heavy-duty switchgear can corrupt internal low-voltage communication signals. danfoss error 1027

Power down the system completely and ensure no residual high voltage remains.

Error 1027 is rarely a "loose wire" fix. If a power cycle doesn't clear it, it usually requires a component-level repair or a board replacement.

He plugged in his diagnostic laptop. The error log showed the same entry, repeated every four minutes for the past two hours. But the timestamp on the first error? That was from before the ship had even left port. Which meant someone had silenced the alarm and hoped it would go away. Error 1027, he realized, wasn’t a software glitch

The LED status on the option card differs from the manual’s “Run” state.

Send a control word bit 07 (Reset trip) via explicit message or from the PLC. Example for Profibus: Control word = 0x0080.

Contact with your drive’s type code (e.g., VLT® FC-102P7K5T4E20H1). They can confirm if the error is known for your series and provide repair options. It assumes you have a multimeter, a laptop

The 1027 error is categorized within the internal processing fault block. It represents a strict system lockout. Diagnostic Category Value / Status Technical Definition 1024–1279 Internal Communication & CAN Bus Range Specific Code CAN Telegram Cannot Be Sent Drive Status Immediate motor coast-to-stop Primary Mechanism Hardware Failure Physical link or control component failure Step-by-Step Troubleshooting Procedure

Before diving into a teardown, document the exact context of the failure (e.g., was the drive running, starting up, or idle?). Then, attempt a hard reset:

drive. He expected the usual suspects—maybe a Phase Loss (Alarm 4) or perhaps an Earth Fault (Alarm 14) from a damp motor cable. Instead, the screen stared back with four cold digits:

If a corrupt register is jamming the data stream, restoring the drive back to factory defaults can clear the lock.