What Does "Com Fail" Mean?
A "Com Fail" message on your security system keypad means that a your control panel attempted to transmit a message to the central station and failed. This can happen for a variety of reasons. Most commonly, a loss of phone service due to a power outage. Even a temporary loss of power may result in a "com fail" message.
Note: A "com fail" message does NOT necessarily indicate that your security system is not working now... It only means that there was a temporary loss of communcation. Often, this happens in the middle of the night when your system is attempting to send a test message to the central station. So, in the morning, as you are leaving for work, you may see a "com fail" message on your keypad. Before you leave, take a moment to clear the message by following these steps: