Noby UK Noby-420 2-Zone User Manual

Page 8

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Noby-420 Installation & Programming Instructions Rev3

Page 8 of 12

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 series 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.
• Some (older) detectors may be incompatible with head-removal monitoring in which case it is recommended

to set the Head Removal Monitor Inhibit (System Options 2).

Fire is detected as Zone Fault

• Check all detector heads on the corresponding zone are fully seated in their bases.
• The panel monitors the zone for a short circuit. Some (older) detectors and call points may be incompatible

with short circuit monitoring in which case it is recommended to set the Zone S/C Inhibit (System Options 2).

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 F2 and/or F3.
• 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.
• Some types of sounders may be incompatible with the Noby-420 sounder circuit monitoring function in which

case it is recommended to set the Sounder Circuit Fault Monitor Inhibit (System Options 2).

CPU Fault Indication

CPU Fault LED Flashing

• It is normal to see a CPU Fault at power-up, and can be cleared by performing a panel reset.
• Persistent CPU faults may indicate interference from electrical machinery or RF transmitters in the immediate


Common Fault Indication

Common Fault LED Flashing persistently

• Check that the Fault Input polarity is correctly programmed (Engineer Programming – Sysop1), and that the

Fault_Input terminal, if used, is in the required state to hold-off the Common Fault LED. Note that the
Fault_Input Polarity option should be disabled (factory default) if the Fault Input terminal is unused or not
connected to remote equipment.

Alarm Relay

Alarm relay not working

• Check that the relay is not isolated.

User Keypad Operation

Reset command [3][6][3][6] [5] is ignored – nothing happens.

• Both the external sounders and internal panel piezo sounder must first be muted before the reset button is

acknowledged. This can be performed in one operation by performing a Quick Reset [3][6][3][6] [1][4][5].