Troubleshooting Refresh Failures

Checking Refresh History

When a semantic model refresh fails, begin with the refresh history in the Power BI Service.

Review:

• The failure timestamp.
• The error message.
• The source or connection involved.
• Whether the issue affects one refresh or multiple attempts.
• Whether the failure began after a change to credentials, schema, network configuration, or the model.

The error details often help narrow the investigation.

Common Refresh Errors

1. Credentials have expired

Update the data source credentials or complete the required authentication process, then retry the refresh.

2. Gateway is offline

Check whether the gateway machine is running, the gateway service is available, and the machine can connect to the source.

3. Data source cannot be reached

Verify the server name, network access, firewall rules, database availability, and any required drivers.

4. Column or table changes

A source schema change can break a query or a model dependency. Review Power Query steps and update them to match the new schema.

5. Refresh timeout or resource limits

A large model or expensive query may take too long or consume too many resources. Review query performance, reduce unnecessary data, and consider incremental refresh where appropriate.

6. Data type conversion failure

New source records may contain values that cannot be converted to the expected type. Inspect the relevant column and correct the source data or transformation logic.

A Practical Troubleshooting Workflow

When a scheduled refresh fails, follow this sequence:

1. Open the semantic model's refresh history.
2. Read the complete error details.
3. Confirm that the data source is available.
4. Verify credentials and permissions.
5. Check gateway status and connection mapping, if applicable.
6. Review recent source schema or model changes.
7. Test the connection and retry the refresh.
8. Confirm that the latest data appears in the report.

Avoid repeatedly retrying a refresh without investigating the cause. If the underlying problem remains, the next attempt may fail in the same way.

Monitor Refresh Reliability

For business-critical reports, establish a process for detecting and resolving refresh failures.

This may include monitoring refresh history, notifying responsible teams, documenting common failure causes, and defining who should respond to an incident.

A dependable refresh process combines correct configuration, suitable scheduling, secure credentials, reliable connectivity, and regular validation of the resulting data.