<p>The ID for the health check for which you want the last failure reason. When you created the health check, <code>CreateHealthCheck</code> returned the ID in the response, in the <code>HealthCheckId</code> element.</p> <note> <p>If you want to get the last failure reason for a calculated health check, you must use the Amazon Route 53 console or the CloudWatch console. You can't use <code>GetHealthCheckLastFailureReason</code> for a calculated health check.</p> </note>