How to check a trouble on Honeywell Vista alarm panel?
Christopher Pierce
Published Feb 24, 2026
How to check a trouble on Honeywell Vista alarm panel?
ALARM 1xx FAULT 1xx CHECK 1xx (Or CHECK 90): Indicates a communications fault with the device listed MODEM COMM (or 91): Indicates that FMC is currently connected with the system remotely. AC LOSS (Or NO AC): Indicates the system is operating on Battery Power due to a lack of AC power to the system.
Why do I get a trouble message on my Honeywell alarm?
Trouble conditions are wide ranging and can be anything from a low battery to a power failure to a communications failure. This will cause the word “CHECK” to appear on the Honeywell Alarm System Keypad, with a corresponding Zone number.
How can I Clear Com fail on my alarm system?
To clear “Com Fail” message, call our office and have us put your system on “test.” Then, arm the system and open a device on your system (eg. window). Let the system go into alarm (actually making the siren sound). At this point, the system will send a signal to the central station and clear your communication failure.
What does communication failure mean in an alarm system?
“Communication Failure” for an alarm system means that it dialed a call, but never received the final confirmation signal (Kiss Off) that tells it that the data transmission was successful. This means anything from a new-style busy signal, to the call being interrupted.
What is the installer code for Honeywell Vista?
1. Access system programming. Enter in [Installer Code] + [800] to access system programming. The default Installer Code for a Honeywell VISTA Panel is 4112. The message “Installer Code 20” will be displayed if you are using an alphanumeric keypad. The number “20” will be displayed if you are using a fixed English keypad.
What does Comm fail mean on a Honeywell alarm?
On an alphanumeric keypad. like the Honeywell 6160, you will instead see the message “Comm Fail”. For all intents and purposes, these messages can be treated as the same issue. Update: As of March 2020, we understand that some users are still using phone lines for alarm system communication.
What to do if your Honeywell alarm is not working?
If you have wireless sensors, ensure environmental conditions are not an issue and if the problem has been corrected, the display can be cleared if you enter the OFF sequence (security code plus OFF key) twice. If the display persists, please contact our service department. The following trouble conditions could also be present on the alarm system.
How do I clear the FC code on my Honeywell alarm?
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.