It sounds like the firmware (program code) inside the receiver is messed up.
About the only thing you can do is try to load in the code you can download from Fortec:
http://www.fortecstar.com/downloads/
You'll need the appropriate cable from a computer to the receiver, and try to update the firmware.
If that doesn't work, I'd guess at that point your receiver had failed, and you need a new one.