Hello Steve,
The WAC Service is used to render the preview images. So the WAC Service has to be installed on all servers in the farm. To verify
In Central Admin go to->Application Management->Manage Service Applications->
Make Sure there is a PowerPoint Service Application and Word Viewing Service.
Assuming that it is and that is not the issue, here are some steps that may help figure out what may going on with preview
o Verify WAC is installed
Choose a Word and PPT doc then click “view in browser” from the document library not from the search results page. Do you see the preview .
o Verify two services are running on the WAC server – These services generate the images.
Word Viewing Service
PowerPoint Service
o Verify that the “view in browser” links are shown and functional in the search results. The View in browser link is populated from serverredirectedurl, and this is also used for doc preview. Verify that it takes you to the WAC, and that the
document is rendered.
o You may also want to navigate to Central Administration and ensure that the proxy group you are using has FAST service application and also the word and the powerpoint application service . To do so follow the steps below
To set/check your application proxy group (where you can modify it) do the following:
•Central Administration
•Application Management
•Configure service application associations and check the above on the proxy group you have chosen
o As smahmood2554 has mentioned please verify that doc preview and/or thumbnail preview is enabled in the core results webpart. (it is on by default). To do so follow the steps below
Click on edit search results page and edit the core results webpart . In the web part properties you should see check boxes for doc preview and thumbnail preview
o If the above steps does not resolve the issue please post the errors if any in ULS logs verbose and fiddler trace to further narrow down the issue .
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Manas-MSFT
