Wait until the LCP (Local Control Panel) display turns off completely. Reconnect the power and see if the error clears. Disconnect mains power and wait for the display to go dark.

If the error persists after a power cycle and manual initialization, it is highly likely that a is required.

: Defective EEPROM data on either the power card or the control card.

: A physical defect in the communication bridge between the control card and the power card.

If you are qualified to open the drive, check the ribbon cables or connectors that link the control card to the power card. A loose connection can trigger communication errors.

Because Error 1027 is an internal fault, manual intervention is often limited. However, you can follow these steps to verify if the drive can be recovered: Disconnect the mains supply.

: Using an incorrect or incompatible spare part during a previous repair.

If you have a similar, working Danfoss VLT drive nearby, swap the control card to see if the error follows the card or stays with the drive.

: Contact an authorized Danfoss Service Partner or supplier to verify if the drive's internal components have failed. Top ten VFD tech support calls - Danfoss

Apply power while holding these keys for at least 5 seconds. Note: This will erase all your custom parameters.