What Does Comm Failure Mean On Adt Alarm – RELATED QUESTIONS How can I resolve the malfunction on my ADT alarm? Connect the white wire to the printed circuit board again. Remove the white wire from the circuit board for 20 to 30 seconds (as seen in the picture below). How can I resolve 103 Comm issues on ADT? Enter the system’s test mode (enter your master code and type 5). In the alarm system, “FC” signifies that the system is not communicating effectively with the monitoring firm. ![]() ADT error code FC is one of the most frequent error codes that appear on ADT alarm systems. What does the term Comm fault mean? In general, a networking communications failure indicates that an incorrect packet was received (incomplete, faulty checksum, collision*, etc.) or that the intended acknowledgment of receipt was not received.
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