I have had this happen, I ended opening the tiu up and there is a chip where the antenna is it sits on the upper corner. Make sure that is seated all the way down on the connection. On mine it moved ever so slight downward. After I did that I powered up the unit again and believe it or not it’s worked fine. Been using it for the last year since and never was a issue again.
That is a generic message. It can mean several things. Mainly it's not getting the response back from the TIU correctly. Is TIU powered up? Red light on? power to track? Something wrecking the signal? Anything new or changed on the rails?
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