404 error page

I have created an error PHP file so if there is any problem when charging a section of the website htaccess redirects to it with the following code but is not working:

ErrorDocument 404 /error.php

The file is named that way. What type error should I use for example when I want to show to the user that the webpage is on maintenance?

A 404 error is for a page “Not Found”. The appropriate response would be 503:

The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.

https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

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