This usually happens due to application pool is getting crashed,
it mostly crashes when if there are a huge number of real-time visitors or may be a bug in a code that creating a loop,
please verify your code once.

You can also restart your application pool for a particular domain using the following steps

  1.  Login to Plesk control panel.
  2.  select a site that you want to restart the application pool.
  3. There you will see the ‘Dedicated IIS Application pool’ option.plesk 503 error
  4. Click on it and Switch OFF and Switch it ON once again.503 error
  5. Now try to load your site.

Note:Dedicated IIS Application pool facility is available only in Platinum and Diamond Hosting plans

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