If you are seeing the embed code instead of the countdown timer, this might be because you're trying to add the embed code directly to an email composed in an email client (e.g. Gmail, Hotmail or Outlook). 

The countdown timer will only render properly if the email is formatted as HTML (not plain text). Most email clients are HTML capable, but not all of them provide an easy way to create HTML emails. Instead, we recommend using the HTML templates offered by services like MailChimp or Campaign Monitor to send out emails with MotionMail countdown timers.

Please see this article on detailed instructions for adding timers to your emails:

Will MotionMail work with my Email Marketing Platform?