This is normally caused by connecting a '+' or '-' speaker wire to either GND or Vcc (+12V)
1. Collect cable not being used and make sure they are tapped off and reset
2. Remove a connected cable one at a time and press RESET
3. If after a cable removal and reset the error goes away, last cable removed was fault. Examine cable for short.
4. If you remove and reset all cables except for (RED, YELLOW, and BLACK) and you stilll have error, the short is internal of unit and requires service
Usually answered in minutes!
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