---
title: "Device Error Codes"
slug: "device-error-codes"
updated: 2025-01-09T15:49:58Z
published: 2025-01-09T15:49:58Z
canonical: "docs.ai-op.com/device-error-codes"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ai-op.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Device Error Codes

The following is a list of error codes that a device can have. In most cases, the [error message field](/v1/docs/error-messages) will contain a detailed explanation for the error code.

| Error Number | Error Code | Problem | Resolution |
| --- | --- | --- | --- |
| 1 | FAILED_TO_CONNECT | Device failed to connect. | Read the error detail message to determine the cause of the connection error. In the case of a timeout, ensure that the device is on the network and responding. |
| 5 | FAILED_TO_READ_DEVICE | Unable to read tag values from device. | See error message for detailed information on why the read failed. |
| 6 | FAILED_TO_WRITE_DEVICE | Unable to write tag values to device. | See error message for detailed information on why the write failed. |
| 7 | FAILED_TO_READ_DB | Unable to read configuration from the Koios database. | Restart Koios machine. If this does resolve the error, contact Ai-OPs support. |
| 11 | FAILED_TO_INITIALIZE | Failed to initialize device parameters. | Restart Koios machine. If this does resolve the error, contact Ai-OPs support. |
| 12 | FAILED_TO_WRITE_MODEL_HISTORY | Failed to save short term historical data to database. | Restart Koios machine. If this does resolve the error, contact Ai-OPs support. |
| 13 | FAILED_TO_WRITE_LONGTERM_HISTORY | Failed to save long term historical data to database. | Restart Koios machine. If this does resolve the error, contact Ai-OPs support. |
| 999 | UNLICENSED | This license is invalid. | Ensure that the license is not beyond its validity period and that the Data Collector is listed in the license’s features. |

*If you experience an error code not listed, please reach out to support@ai-op.com.*