SHORT FAULT (also may display a "LOOP" or "SIGNAL" or "NAC" followed by a number identifier):Ī wire to wire short circuit will often result in a display like this.ĬOMMUNICATION FAULT (may also display as "FAIL TO COMMUNICATE" or "COMM FAILURE": Ground faults are not difficult to pinpoint but often present a challenge to the servicing technician when more than one are present on a system or if the fault is intermittent (as may be the case for water ingress). Another frequent cause of a "Ground Fault" is water ingress at a field device such as a ceiling mounted smoke or heat detector.
In some systems a fault condition can be artificially generated when the wiring is incorrectly terminated or when multiple power supplies with no common connection are involved. In the latter instance, the wire can become abraded (skinned) during the installation process exposing the bared conductor(s). This can be caused by a wire to an INPUT or OUTPUT DEVICE that is "pinched" or been abraded so as to contact the metal backbox (or conduit). GROUND FAULT (also may display as "EARTH FAULT"):Ī condition in which an alarm system references a structure's common ground plane. It could indicate a blown fuse, tripped resettable breaker, non-functional charger, disconnected or faulty battery. Usually indicates a specific problem related to the condition of the stand-by power supply or battery. A "short" or "open" condition may also be identified.īATTERY FAULT (also may display as "STAND-BY POWER TROUBLE" or "BATTERY TROUBLE" or "CHARGER TROUBLE"): If an "open", additional troubles may also be queued that relate to the failure of one or more active field devices from communicating their condition with the common control.īASE SIGNAL TROUBLE (also may display as "NAC CIRCUIT FAULT" and may also identify a circuit or module number):Ī fault on a bell or output circuit may display a variety of specialized messages in addition to the basic trouble message.
LOOP TROUBLE (also may display as "LOOP 1", "LOOP 2", "LOOP 3" followed by the word "TROUBLE" and/or "OPEN" or "SHORT"):Ī condition which may be caused by an interruption of the data communication link (or signalling line circuit) caused by either an "open" circuit, "short" circuit, or device failure. Contacting your fire equipment service provider, a certified fire alarm technician or a qualified electrician would be the prudent thing to do. NOTE: Many of the messages you see displayed here indicate a fault with your system that may require immediate attention and service.
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