78 NFS2-640 Operations P/N 52743:L4 06/10/19
Point and System Troubles Lists System Troubles
PANEL DOOR OPEN The panel door is open. Close door.
POWER SUPPLY COMM
FAIL
There has been a communication failure with the power
supply.
Service is required.
PROGRAM CORRUPTED The database that houses the panel’s programming is
corrupt.
The database must be re-downloaded, or all
programming must be cleared and re-entered. If the
trouble still does not clear, contact Technical Services.
PROGRAM MODE
ACTIVATED
A user is currently accessing the panel’s programming
menus.
No action is required / Exit the Programming mode.
RELEASE DEV. DISABLE Releasing devices have been disabled. Enable the devices.
SELF TEST FAILED Diagnostic test failed. Call Technical Services.
CLASS A POS. LOOP x There is an open circuit on the positive side of loop x. Class A and Class X are supervised methods of
communicating with addressable devices. If the control panel detects a trouble (open), it will drive both ends of
the loop, maintaining communication in an unsupervised method. The latching trouble will display on the panel as
a Class A trouble until you correct the condition and press RESET. Class X configuration of the SLC requires the
use of ISO-X isolator modules.
CLASS A NEG. LOOP x There is an open circuit on the negative side of loop x. Class A and Class X are supervised methods of
communicating with addressable devices. If the control panel detects a trouble (open), it will drive both ends of
the loop, maintaining communication in an unsupervised method. The latching trouble will display on the panel as
a Class A trouble until you correct the condition and press RESET. Class X configuration of the SLC requires the
use of ISO-X isolator modules.
CLASS A SHORT LOOP x Class A and Class X are supervised methods of communicating with addressable devices. If the control panel
detects a trouble (open or short), it will drive both ends of the loop, maintaining communication in an
unsupervised method. The latching trouble will display on the panel as a Class A trouble until you correct the
condition and press RESET. Class X configuration of the SLC requires the use of ISO-X isolator modules.
SYS INITIALIZATION The devices are initializing. No action is required, as the trouble will clear when
initialization is completed. However, devices will not
report off-normal events while this trouble exists.
TERM. SUPERVISORY There is a communication error with the CRT-2. Check connections to the CRT-2 terminal.
UDACT NO ANSWER The UDACT or UDACT-2 is not responding. Determine whether the UDACT/UDACT-2 is
functional, and connected and addressed properly.
UDACT TROUBLE The UDACT or UDACT-2 is in trouble. Determine if the UDACT/UDACT-2 is functional and
wired correctly.
* This trouble may be fire panel or backup battery related. Test and replace backup batteries if necessary/
SYSTEM TROUBLES
TROUBLE MESSAGE
TYPE
TROUBLE DESCRIPTION ACTION
Table D.2 System Troubles
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