It sounds like you have a control rod that was fallen off. You will need to remove the seat and then flip it over to inspect. There could be a small rod that has come disconnected that will need to be reattached.
Here are diagrams below to help you see what I am talking about.
Check out the diagrams (Below)
Please let us know if you need anything else to get the problem fixed.
Images (Click to enlarge)
Wednesday, November 23rd, 2016 AT 12:32 PM