Consider the Troubleshooting CloudFormation guide.
Use the CloudFormation console to view the status of your stack. In the console, you can view a list of stack events while your stack is being updated. From this list, find the failure event and then view the status reason for that event. The status reason might contain an error message from AWS CloudFormation or from a particular service that can help you troubleshoot your problem. For more information about viewing stack events, see Viewing AWS CloudFormation stack data and resources.
You can also use the AWS CLI to describe your stack's events and search for the failures in the list:
aws cloudformation describe-stack-events --stack-name myStackName
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