Chapter 3: Fault finding – ECU faults
ZP3-ECU Extinguishing Control Unit Maintenance Manual
23
Extinguishant pressure verification switch fault
Indications
• The Fault LED on the ECU front panel illuminates.
• A GNFLT fault message is displayed on the fire alarm control panel and the
panel buzzer sounds. The Fault LED on the fire alarm control panel also
illuminates.
GNFLT Zone 001 Dev 5001 Event 002
Possible causes
1. SWT3-1 on the main PCB of the ECU is set to ON and the Extinguishant
Pressure Verification Switch is NOT connected.
2. SWT3-1 on the main PCB of the ECU is set to OFF and the Extinguishant
Pressure Verification Switch IS connected.
Corrective actions
1. Press the Accept/Panel Silence button to silence the buzzer to acknowledge
the fault.
2. Switch OFF SWT3-1 on the main PCB of the ECU (cause a) or alternatively
switch ON SWT3-1 on the main PCB of the ECU (cause b).
3. Reset the panel.
