[SalesForce] Cannot deploy custom fields due to Test Coverage requirements

I'm trying to deploy a change set to Prod but I get the following error:
Average test coverage across all Apex Classes and Triggers is 67%, at least 75% test coverage is required.
My change set only includes some custom fields, a page layout and a record type. I'm not sure why I'm getting this error or how to resolve it.
Any assistance would be appreciated.

Best Answer

This is documented. You will need to increase the code coverage by creating or improving your test classes.

If the deployment includes components for any of the following metadata types, all the tests are automatically run. ...

  • CustomField
  • CustomObject
  • ...

...

http://www.salesforce.com/us/developer/docs/api_meta/Content/meta_deploy_running_tests.htm

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