Service Unavailable HTTP Error 503 while opening Central Administration in SharePoint 2013

There may be scenario that you are trying to open Central Administration on your browser and getting the following error:

Specially, in the VM environment, if you don't properly shuts down  before closing the days work, the service required to run Central Administration get stopped. To fix the problem,

 Go to -> IIS Manager -> Application Pools

You will observe the following screen:

Observe the SharePoint Central Administration v4.0 service is stopped for some reason. Just right click on the service and start it as follows:

Now observe that it is started as below screenshots:

Run the Central Administration again and you will observe it is working properly as follows:

That's it. Happy SharePointing....!!