FireNET Trouble Messages list Loop Troubles: Loop Open Circuit – indicates an open in the class A loop or the zero ohm shorting jumper has lost connection (class B). This is not self restoring - must reset panel after condition has been cleared. Loop Short Circuit – indicates a direct short circuit on the loop. This is not self restoring - must reset panel after condition has been cleared. Loop Wiring Trouble/Ground Trouble - indicates a ground fault condition on the loop. This condition is typically accompanied by the Ground Fault LED on the power supply. This fault condition commonly affects all the loops at the same time as the VCC reference voltage is common throughout the control unit board. The best method to begin troubleshooting is to remove the loops one at a time and watch for the Ground Fault LED on the power supply to extinguish. Loop Not Fitted - indicates the loop is not installed (loops 3 & 4 in the case where the loop expander is not physically installed and the configuration in the panel expects the panel is a four loop) or, one of the loops has been damaged due to caustic electrical condition(s) and is no longer operational. In this case the control board (for loops 1 or 2) or the loop expander board (for loops 3 or 4) must be replaced. Device Troubles: Disconnected Device – indicates a device which is in the panel’s current configuration, is not physically detected by the panel. For Aux powered devices such as the SOM, this is also indicated if the device looses its auxiliary power. Unexpected Device – indicates a device which is not in the panel’s current configuration is physically detected by the panel. Bad data Trouble – indicates a device is not communicating properly with the panel. This is typically caused by environmental conditions such as excessive EMI or improper cable distances or cable types, improper wiring, or a damaged device. Unknown Device – indicates the device is not recognized by the panel. This is typically caused by environmental conditions such as excessive EMI or improper cable distances or cable types, improper wiring, or a damaged device. This can also indicate the device type is not a recognized by the panel’s firmware. Verify proper firmware revision. Slave Line Open Circuit – Indicates an SOM module’s output (NAC) circuit is in an open circuit condition.