1.3 System faults
System faults are unique in that they do not automatically clear when rectified. Three different types of system
fault can occur; watchdog fault, site memory corruption fault or PLL (phase lock loop) fault.
•
To find out which type of system fault has occurred:
1. Remove the panel’s lid using the Torx key provided and press the ACCESS LEVEL THREE FUNCTIONS
button on the Main Control PCB to gain access to the panel’s engineer functions (see below). Note: If
pressing the ACCESS LEVEL THREE FUNCTIONS button (or any other button) does not cause any change
in state, the Main Control PCB is faulty and must be replaced.
2. Continue pressing the ACCESS LEVEL THREE FUNCTIONS button until the SYSTEM FAULT light pulses.
If there is a Watchdog Fault, Zone 1’s Fault light will be lit.
If there is a Site Memory Corruption Fault, Zone 2’s Fault light will be lit.
If there is a PLL Fault, Zone 3’s Fault light will be lit.
For a detailed description of what each fault is, and suggested action on how to rectify it, see below:
•
Watchdog Fault
This type of system fault occurs when the panel’s microprocessor has failed to operate correctly. In this case the
panel’s ‘Watchdog’ circuit will attempt to bring the microprocessor back under control and return all outputs
and indicators to their normal state. If the watchdog cannot restart the microprocessor then the General Fault
and System Fault lights will be cycle continuously, plus the panel’s internal sounder will activate.
Suggested action:
Press the panel’s RESET button and, if still in access level 3, the ESCAPE ACCESS button. This should clear the
fault. If the fault persists, the Main Control PCB is faulty and must be replaced.
•
Site Memory Corruption Fault
This type of system fault occurs when site specific data held in the panel’s microprocessor is found to be corrupt.
Suggested action:
1. Check all the site specific data (delays, disablements, etc) at user and engineering levels. The System Set-
Up Data Chart in the User Manual / Log Book (page 13) includes relevant set-up information.
2. If errors are found, reprogram the panel accordingly to clear the corruption.
3. If no errors are found, temporarily change some data, e.g. disable zone 1, exit user mode and then re-
enable zone 1 to return to the original settings. This should clear the fault. If the fault persists, the
memory is damaged and the Main Control PCB must be replaced.
•
PLL Fault
This type of system fault occurs as a result of a momentary disturbance in the panel’s microprocessor.
Suggested action:
Resetting the panel should clear the fault. If the fault persists, the Main Control PCB is faulty and must be
replaced.
LPCB APPROVED CFP ALARMSENSE 2/4/8 ZONE FIRE ALARM PANEL
INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002020 Rev 4 • Page 21 of 24
DELAYS
TEST
NONLATCHING
COINCIDENCE
ACCESS
LEVEL THREE
FUNCTIONS
OPEN
CIRCUIT
SHORT
CIRCUIT
REPEATER
FAULT
SYSTEM
FAULT
SW8
CFP ALARMSENSE PANEL CONTROLS
HEAD
OUT
SOUNDER
STATUS
