Servers removed from farm but continue to appear in farm health reports

Delete the entry from the farm Health Report, and then let the rule be run again as per its normal schedule or manually run the rule.  The removed farm servers will no longer appear.

Rebuild an Microsoft Office Web Apps server farm easily

1. Take the Microsoft Office Web Apps server farm offline if there is a load balancer.
2. Collect the current farm information through PowerShell by using the following command on an Microsoft Office Web Apps (WAC) Server(s):Get-OfficeWebAppsFarm > c:\MyWACfarm.txt
3. For a multi-server farm, remove each child machine from the farm, and then remove the parent machine by using PowerShell on WAC Servers.Remove-OfficeWebAppsMachineTo find which server is the Parent and which servers are the Child, review the farm output from step 2 and look toward at the bottom for “Machines” listed. The first server is your Parent server and the rest are Child servers. Run the following command on the Child servers first, and as soon as it is completed, run the command on the Parent server. This will delete the farm.
4. Reboot the Office Web Apps Servers.
5. Re-create the farm through PowerShell on WAC servers by using the parameter values from the command that we ran in step 2.New-OfficeWebAppsFarm -InternalURL “http://WACServer.corp.contoso.com” -AllowHttp -EditingEnabled -OpenFromURLEnabled
6. Reunite the Child servers with the Parent server through PowerShell on the WAC server. To do this, run the following command on each Child server:New-OfficeWebAppsMachine -MachineToJoin ParentServer
7. Put the farm back online if there is a load balancer.If you want to rebuild the bindings, run the following commands on SharePoint Servers through SharePoint PowerShell:Remove-SPWOPIBinding –All:$trueNew-SPWOPIBinding –ServerName “WACServer.corp.contoso.com” -AllowHttp

To verify that your Microsoft Office Web Apps server farm was configured correctly, go to https://servername/hosting/discovery in a web browser.

If Office Web Apps server is working as expected, you should see a Web Application Open Platform Interface Protocol (WOPI)-discovery XML file in your web browser.

Repair Office Web Apps Farm 2013

(Get-OfficeWebAppsFarm).Machines

Repair-OfficeWebAppsFarm