Danfoss Error 1027 ^new^ Jun 2026

is a critical fault code that typically appears on Danfoss VLT HVAC drives, FC-series frequency converters, and certain refrigeration controllers. If you are staring at this code on a display panel, your equipment is likely in a fault state, meaning the drive has stopped running to prevent damage to the motor or compressor.

If you are using an external 24V DC backup supply (to keep the control panel alive when mains power is off), a noisy or under-voltage external supply can corrupt the internal serial communication, generating a false 1027.

If a spare LCP is available, swap it to rule out a keypad failure. Inspect External Loads: danfoss error 1027

Disclaimer: Always follow local electrical safety codes. High-voltage DC bus capacitors can remain charged for up to 40 minutes after power is removed.

You can solve 60% of 1027 errors with cleaning and soft resets. However, you need a certified repair center if you experience the following: is a critical fault code that typically appears

: When the error remained, he suspected the control card. He knew from IBA Lift's Technical Documentation that 1027 is a persistent hardware warning that often requires contacting the supplier for a replacement.

Danfoss Error 1027 is never "just a glitch." It indicates a physical problem on the power side of the drive. If a hard reset (power cycle) does not clear it for 24 hours of continuous operation, prepare to replace the Power Card or the complete Gate-Drive Unit . Running a drive with a persistent 1027 can damage your motor due to phase imbalance. If a spare LCP is available, swap it

: Severe electrical noise from unshielded cables can interfere with internal digital signals, causing "ghost" communication errors. How to Troubleshoot Danfoss Error 1027

The drive’s brain (control card) is not communicating correctly with the muscle (power transistors). As a safety precaution, the drive shuts down.

An error 1027 on a Danfoss device typically relates to a hardware or communication failure

A disruption in the data flow between the control card and the power card. Voltage Limit Issues: