Chapter 7: Service and troubleshooting 
P/N 3101890-EN • REV 006 • ISS 21JUN18  147 
  Response 
Remove a module or pull station
, 
einstall a different 
module/pull station of the same type 
in the same location.
 
A GSA-UM replacement 
JP1 set in 
the same position as the original 
module.
 
•  A system trouble displays on the LCD screen when the module/pull 
station is removed. The message shows the device’s station label or 
address. 
•  The loop controller remaps the circuit, replacing the serial number of 
the old device with the serial number of the new device
is enabled. If the devices are modules (not pull stations), the old 
module’s personality codes are transferred to the new module. The 
system returns to normal when mapping is finished. 
•  The communication fault for the old detector remains
enabled. 
, and then 
einstall a different detector type in 
 
•  A system trouble displays on the LCD screen when the detector is 
removed. The message shows the detector’s label or address. 
•  The loop controller remaps the circuit, replacing the serial number of 
the old detector with the serial number of the new detector, when 
mapping is enabled. All of the old detector’s sensitivity and verification 
settings are transferred to the new detector. The new detector will be 
operational but a system trouble displays, indicating a device type 
mismatch. To clear the trouble, the new detector type must be 
assigned to the base using the VM-CU and the database downloaded 
to the panel. 
•  The communication fault for the old detector remains
enabled.  
Remove a module or pull station
, 
einstall a different 
module/pull station type in the same 
location.
 
•  A system trouble displays on the LCD screen when the module/pull 
station is removed. The message shows the device’s station label or 
address. 
•  The loop controller remaps the circuit, replacing the serial number of 
the old device with the serial number of the new device
is enabled. The new device is not operational. A system trouble 
displays, indicating a device type mismatch. To clear the trouble, the 
new device type must be defined using the VM-CU and the database 
downloaded to the panel. 
•  The communication fault for the old detector remains
enabled. 
•  If a single address module is replaced with a dual address module or 
vice versa, a map fault is generated by the address count mismatch. 
 
Signaling line circuit troubleshooting basics 
The VM-SLC signaling line circuit card provides one Class B, Class A, or Class X signaling line circuit that 
supports up to 125 detector and 125 module addresses. The card also provides resettable 24 VDC for powering 
conventional two-wire smoke detector circuits on V-Series modules. When a device is removed from the loop, the 
loop controller recognizes the change and the control panel processes the information.  
Note: The VM-SLC-HC is an optional replacement card for the VM-SLC. The VM-SLC-HC  should be used for 
installations where the signaling line circuit has more than 90 isolator modules and isolator bases (with V-Series 
sensors installed).