Dialer Communication Failure would indicate the M1 attempted to send a signal to your Central Monitoring Service (Alarm.com) and did not receive the Acknowledgement for their receiver. This message will continue to display until the M1 does receive the expected Acknowledgement signal from their receiver. Power cycling the M1 does clear the message. In the M1XEP Setup under the Central Station Tab do you have “Supervise the Connection with a Heartbeat Interval Time Value”?