The receiver thinks the dish needs to move because it hasn't got a signal.
The Diseqc communication to the motor is one way, the only way it knows when it has got there is that it has got a signal.
There couls be many reasons for your problem, the usual, LNB fault, cable problem, dish out of alignment etc etc.
Does the dish actually move at all ever?
I would suspect a dodgy cable fault to start with. |