The message flashes and shows a battery symbol (even though the device has no battery) and it will not operate the retic.
The short answer to what is happening is one of two things:
a) The controller is on the way out. If it does this intermittently and if the display is shaking then count on it being the controller.
b) There is a problem with a solenoid and it is sending a message back to the controller telling it that the coil on the solenoid needs replacing.
We can diagnose within 5 minutes and have you up and running again quickly.