Error: The search request was unable to connect to the Search Service

I am unable to get the Search functionality working in my SP site.  I have a new SP farm (2 app, 2 web, 1 sql) which I am working on configuring.  I've migrated a site collection from my development environment which appears to be fully functional other than the Search.  I created a seperate Enterprise Search site and that works fine.  This leads me to believe it's something specific with the site or the search service application I configured. 

When I search for something on the site it throws the error:  The search request was unable to connect to the Search Service.

When I view the search service application in CA it shows over 300 searchable items, crawls completing successfully, etc.  I verified my site has the correct service application association selected.  I think my Enterprise Search site uses a different search service application though (FAST Query SSA).  I think I've gone through all the settings to verify the correct account is being used.  Any advice on what I can do/try next? Thank you!