Noby-448 Installation & Programming Instructions (Rev.5) Page 7 of 12
TROUBLESHOOTING
Power Supply
The Power LED not illuminated?
• Check that the mains supply is connected and switched on.
• Check the fuse in the terminal block adjacent to the transformer.
• Check the fuse F8 on the main board.
PSU Fault LED continuously illuminated?
• The panel is detecting low voltage (< 21V) from the batteries.
• Check the batteries are connected correctly, in series, and observing strict polarity.
• The batteries may be heavily discharged – allow approx. 1hr for a partial re-charge.
The PSU Fault LED will flash when the battery voltage increases to 23V.
The PSU Fault will clear when the panel is reset.
• The batteries may be faulty – replace as necessary.
PSU Fault LED flashing?
• Check the batteries are connected correctly, in series, and observing strict polarity.
• Check Fuse F7 (Battery).
• Check Fuse F1 (Ext. Remote / and Aux 12V ).
• Check Fuse F2 (Aux 24V).
Zone Faults
Zone Fault LED continuously illuminated?
• Disconnect the relevant zone and replace with the EOL resistor (4K7) at the zone terminal. If the fault can
now be cleared then there is a possible wiring error in the zone.
• Check that the correct value EOL resistor is fitted at the end of the zone.
• Check that the wiring and connections at each detector are consistent, and not crossed-over at any point
along the cable run.
• Check that all manual call-points in the zone are intact and fitted with an appropriate EOL resistor, typically
470 ohms.
• If a Zone Fault LED becomes continuously illuminated when a head is removed, then that detector base may
be the wrong type. Check that a schottky diode is fitted and correctly connected.
Replace the suspect detector base if necessary.
Zone Fault LEDs Flashing?
• One or more zones are isolated.
Zone Fault LED intermittently winking?
• A detector head is either missing or incorrectly connected.
• Check all detector heads on the corresponding zone are fully seated in their bases.
Sounder Faults
Sounder Fault LED continuously illuminated?
• Enter the code [6][2][5][3][1][1] to bring up the sounder fault display, shown by the zone fault LEDs.
• Check the corresponding sounder fuses F3, F4, F5 or F6 on the main board, or fuses F1, F2, F3 or F4 on
the Noby-448XT extender board (if fitted).
• Disconnect the suspect sounder circuit and fit a 4K7 EOL resistor at the sounder terminal. If the sounder
fault clears then there is a possible wiring fault in the circuit. Check all connections between sounders.
• Check that the correct value 4K7 EOL resistor is fitted in the circuit.
Zones 5 to 8
Continuous Zone Faults And Sounder Faults?
• If the Noby-448XT module is fitted then check that the 10-way ribbon cable connector is secure.
• If the Noby-448XT module is not fitted, then ensure that the programmable option ‘Configure Noby-448XT 4-
Zone Extender’ is set to de-activate zones 5 to 8.
Zones 5 to 8 Don’t Work At All?
• The Noby-448XT module is not fitted, or the ribbon cable not connected.
• The programmable option ‘Configure Noby-448XT 4-Zone Extender’ is not set.
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