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Herein, what does no AC mean on Honeywell alarm?
AC LOSS/NO AC - Power failure or lack of AC power in the system, making it run on battery power instead. Busy-Standby/dl - The system is disabled if this trouble code has been displayed for more than one minute. OPEN CIRCUIT/OC - The Honeywell security keypad is not receiving signals from the control panel.
Regarding this, what does FC stand for on a Honeywell alarm system?
This will clear the phone number that was programmed. It will also adjust the dynamic signaling settings for the panel to prevent future FC messages. An FC code stands for "Failed to Communicate". It basically means that the panel attempted to dial out, but its outbound dialing signal was not successfully received.
AC power failure on your security system means that the system is not receiving plug-in power from a wall outlet. To remain powered, the system has switched to its backup battery. An alarm system requires power at all times to remain powered on.