EP203 AUTOMATIC EXTINGUISHER PANEL
Page 36 of 45 • EP203 AUTOMATIC EXTINGUISHER PANEL INSTALLATION MANUAL • Approved Document No. DFU0002032 Rev 4
Sounder Faults
All three alarm sounder circuits are monitored for open and short circuit faults (unless
disabled, or in an alarm condition).
An open, or short-circuit fault on a sounder circuit is indicated by the following:
• Internal panel sounder activates
• General Fault yellow LED flashes
• Sounder Fault yellow LED flashes
• LCD unit displays the specific fault (e.g. Sounder circuit 1 O/C fault, Sounder
circuit 2 S/C fault).
To determine w hich o f the panel ’ s th ree sounder circ ui t s i s fa ul ty
1. Disconnect each sounder circuit from the Main Control PCB in turn and measure the
resistance between the two wires. A healthy circuit will display only the end-of-line
resistor value. Any other resistance value signifies a fault.
2. If the readings from all sounder circuits are correct, take their end-of-line resistors
and connect them to the sounder circuits at the panel terminals. If the fault persists,
the Main Control PCB is faulty and must be replaced.
3. If a sounder circuit fault is detected, correct the fault and reconnect the sounder
circuit. The sounder fault will automatically clear within 60 seconds.
Note: If the sounder circuit is shorted and the alarm voltage applied, the relevant
sounder fuse will trip. When the fault is removed, the fuse will automatically reset.
Power Supply Faults
Note: The power supply status can be viewed at Access Level 3, selecting the
Engineering menu, then selecting Show PSU Stats.
When a power supply fault occurs the LCD unit displays the specific fault and the Power
Supply Fault yellow LED flashes. A power supply fault arises when one, or more of the
following conditions have occurred:
• The mains supply voltage is too low, or has failed completely
• The mains supply fuse (F1) has ruptured
• The battery fuse (F2) has ruptured
• The battery supply voltage is too low
• The Power Supply PCB is faulty.
The following lists typical fault diagnosis for power supply faults:
The mains supp ly v ol ta ge is too low , o r has fai led c om ple te ly
Sy m p tom s : The EP203 panel is running on batteries, but NOT on mains supply.
The LCD unit displays ‘Mains=FAIL’ and the Hazardous Voltages Present red LED on the
Power Supply PCB is lit steady.