Short circuit middle
Device wired incorrectly. See wiring diagram.
Device is drawing too much current. A faulty device may draw too much current and be detected as a
short.
Replace the device.
Fault at address
There are several possible causes of faults at individual addresses, the panel may show more
information (e.g. which channel for 3 channel IO) or may show analogue value for the fault:-
Device is missing, unlikely after an auto-learn as a missing device wouldn't have addressed. Incorrect
earthing may cause this. This fault would have an analogue value of 0.
A repeater, sounder control unit have their own power supply if the PSU is not on and there is no
battery, the device will show a fault, analogue value 0.
Detector low analogue value fault. If the detector shows analogue value of 1 the detector may need
replacing or cleaning.
End of line resistors not correct. IO units, ZMUs etc. have end of line resistors. If they are not wired
correctly the panel will show a fault at this address but will give specific information (ZMU detector
zone etc.) about the fault.
Earth Fault
An earth fault may be associated with other faults or random fires.
This should be cleared before trying to sort out these other faults as it may be the root cause.
Power down the panel, disconnect all loops, sounders and relay connections. Ensure the panel is
correctly earthed.
Check the +ve & -ve cables to screen/earth, ensure greater than 1 Mohm. Check that the screen is
not tied to building earth.
Repower the panel if the fault remains with the cables disconnected, examine the Pcb’s for
contaminants or shorts.
Sounder 1 or 2 Fault
This is a fault on one of the two conventional sounder channels. Common causes would be:-
One of the fuses has blown.
End of line resistor not fitted.
Sounder wired incorrectly. See wiring diagram.
Sounder circuit is shorted.
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