Antenna overload

[Satcat]

My sons spiderbox HD6000 has stopped working and shows the message "antenna overload" I thought it must be a bad f plug connection or the cable at fault, but the problem is still there when the coax cable is disconnected. I can only assume it must be a fault in the box.
Anyone know what the problem may be.

[saintomer1866]

Maybe this
https://www.satpimps.co.uk/showthread.php?177013-Help-antenna-overload

seems a common problem...
https://www.satpimps.co.uk/search.php?searchid=27346



St.O

[Satcat]

Cheers St.O, but my problem is that I get that message whether it's connected the the dish or not.