Does the message disappear if you unplug the coax from the Dish? If so it will rule out the STB and indicates a problem with the cable or LNB.
Yes it does dispappear.
The message you have stated normally would indicate a short in the satellite cabling, or LNB. To test if the box is causing the issue you would just need to disconnect the satellite cable and see if the message still comes up.
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Won't be the dish itself but lnb or cabling