My furnace operates fine, until I switch from heat to cool. When I switch it willnot do anythig and I have to call out a reapirman. My house was under warranty and I thought the problem was resolved, but it wasn't . What are some thins I can look at?

Did the last repair man share with you regarding what he fixed? Check his repair ticket to see what was done. Try the same fix.

Try looking through the sticky at the top of the forum. If you don't find any help there, post back telling us a little more about your system.