Some basic checks.
Do you have dual coax connections from the dish or only one ?
If two are they connected to the outer f connectors with the centre one unused ?
If only one have you connected the cable to tuner 1 in and used a short length of coax to connect tuner 1 out (the centre connector) to tuner 2 in.
Now use Menu System Diagnostics – Does your display at the bottom show both tuners have a signal.
Next check your box operating mode
Press
Menu
Setup
Right to enter menu
Red Button
Green Button
Yellow Button
Blue Button
Green Button
Yellow Button
Blue Button
OK on Antenna Setting
Post Antenna Type and Connection type.