1027 Verified — Danfoss Error

Before proceeding, remember that working on a Variable Frequency Drive involves high voltages that can be lethal. Always follow proper Lockout/Tagout (LOTO) procedures.

Re-apply power and monitor the Local Control Panel (LCP). If the fault immediately re-emerges, it is a permanent hardware issue. Step 2: Check Active Sub-Codes via the LCP

[Power Cycle Drive] ──> Still Faulted? ──> [Perform Initialization] ──> Still Faulted? ──> [Isolate EMI] ──> Replace Card Step 1: Perform a Full Power Cycle Switch off the main power supply to the Danfoss drive.

Here is what it means and how you can get your system back online. What Does Danfoss Error 1027 Mean? danfoss error 1027

In industrial automation, Danfoss VLT drives rely on precise, high-speed information exchange between the control card, power card, and option modules. Error 1027 specifically falls into the internal hardware diagnostic bracket (typically covering codes 1024 to 1279).

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

: Ensure motor cables use proper EMC-compliant shielding and that the shield is grounded correctly at both the drive and the motor ends. Before proceeding, remember that working on a Variable

The primary cause of Error 1027 is often related to an unsuccessful calibration process. When a Danfoss thermostat is mounted on a valve, it must perform a "travel test" to determine the fully open and fully closed positions of the valve pin. If the device detects an unexpected resistance or if the valve travel distance falls outside of the pre-programmed parameters, the system may trigger Error 1027. Furthermore, signal interference or a weak connection to a central gateway can cause data packets to drop during a configuration sync, leading the device to enter this fault state to prevent improper heating cycles.

Disclaimer: This guide is for general troubleshooting. Always refer to your specific Danfoss product manual and consult a qualified electrician or technician before servicing the drive.

Record your software version and complete serial configuration from the side chassis sticker, then reach out to an authorized service center or use the Danfoss Technical Support Hub to schedule a module replacement. If the fault immediately re-emerges, it is a

To fix the issue permanently, you must first identify what triggered it. The code points directly to physical logic board failures or severe interference. 1. Internal CAN Telegram Failure

Minor logical glitches or voltage spikes can freeze internal processors. Turn off the main incoming power supply to the VFD.

Similar, but not identical. CANopen “Bus Off” means hardware-level fault. Error 1027 is higher-level protocol timeout.

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

Though less common than a physical hardware fault, a severe corruption of the drive's firmware can also lead to this error. This is more likely to occur after a failed firmware update, a significant power event (like a lightning strike causing a power surge), or due to a bug in the installed software version. A minor, one-time glitch can sometimes be resolved with a power cycle, but if the code persists, the firmware itself may be corrupt.