Often, the receiver gets stuck in a error loop. A hard reset clears the temporary memory and forces the box to re-search for the signal.
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Before calling a technician, follow these steps to resolve common software or minor hardware glitches: dish tv error 301 signal not found solution
This is distinct from an error like "No Signal" on your TV screen (which usually means the TV isn't connected to the box properly). Error 301 specifically indicates a breakdown between the dish antenna and the satellite. Often, the receiver gets stuck in a error loop