It sounds like your controller lost the wireless address.
At the outdoor control
2.press down button, scroll to settings.
3.Press right button to select.
4.Press up button, scroll to "Wireless Address"
5.Press right button to select.
"Address Wireless scanning" will display, Then "Sending Address" will display.
6.Now repeat steps 1-5 with the handheld wireless controller, "Address Found" will display
7.Press menu button on control panel 3 times to return to main screen.