Chapter 7: Service and troubleshooting
156 P/N 3101890-EN • REV 006 • ISS 21JUN18
m Possible cause
A ground fault is detected on the loop
• There is a pinched wire between a device and the electrical box
• The loop wire is nicked and making contact with ground
An internal trouble is detected on the loop
• A detector is defective or dirty
• A CO module is defective or not seated correctly
• A photo or heat sensor is reading too high or too low
• A light source is affecting a detector
•
A wiring terminal flange in the detector base is touching another
terminal flange
• An isolator or relay base is defective
• Devices are drawing too much or too little current during
mapping
A maintenance alert is detected on the loop
A detector needs cleaned
The system reports an “End of life ACT”
event
A CO module needs replacement
Mapping errors
Table 62 lists basic mapping errors. For information on identifying and locating mapping errors, refer to “Using the
Configuration Utility diagnostics tool” below.
Note: Do not replace factory-programmed devices such as pull stations and MM1 modules with a GSA-CT1.
Table 62: Signaling line circuit mapping errors
Possible causes
A mapping error is detected on the
loop
• There is a discrepancy between the expected map and the devices
installed on the loop (serial number, personality code, or device type)
• A device ID is incorrectly entered in the VM-CU
• There are more than 124 T-taps on the loop
• There is excessive circuit resistance
• There is excessive circuit capacitance
The system continues to remap
the
• An intermittent connection is
causing one or more devices to lose then
reestablish communication with the loop controller
• There is a defective device or detector base
There is a device type error
There is a discrepancy between the device type recorded on the internal
map and the device installed on the loop
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